1. Be Attractive
What? Seriously? That's your advice? Um, yeah. Ask yourself before you get all mad about this one, if a sexy AF guy/girl walked up to you and asked you for 50 cents---are you going to say no if you had it vs. to one that was kind of bummy and not so attractive or even ugly? Now if you aren't exactly "the sexy" type, attraction can come in the form of being confident, approachable, and open. Approach someone with your favor or want in mind with a confident stride and a friendly way about you. You can disarm people in this manner because you bring down the threat wall or the creepy factor by not appearing like you have any intention of bringing harm to this person or are threatening in anyway. We respond a lot better to someone with a smile who appears friendly then we do to someone scowling or perceived to be threatening or mean.
2. Be Nice
This is totally super difficult advice to follow right? Yes, be nice! Who do you want to do favors for...not your a-hole boss who can't remember your name, but Ronny in copy who always says hello and has a kind word to say or Karen who always remembers your birthday. Being nice endures you to people and makes them so much more willing to do stuff for you...but don't simply attempt to be nice right around the time you always need something. People see right through that BS as them being manipulated rather than a longer end game that will get more done for you on a consistent basis because you always are or at least appear to be nice to all around you.
3. Convince them it was their idea
People in control don't like to have it taken away. They want to be the idea person, they want to be the one people applaud for, and they can get jealous of those who take that attention from them, so give it to them...or at least the illusion you've given it to them. Subtly suggest brilliant ideas to them that you want done. "I think you'd really enjoy a weekend at the beach." "You remember the last time you drove us all to the beach, we had a blast, everyone said so." "You come up with the BEST ideas, like going to the beach." Pump this on theme message into their brains long enough, they just might get the brilliant clue to...go to the beach and take you with them.
4. Play to their ego
Everyone wants to feel like they are really good at something and when you flatter someone into thinking they are or they genuinely are good at something, you can get them to essentially do the work for you. "I can't ever seem to edge up the yard as good as you dad, can you show me one more time." "Mary, I've tried to make your famous cake, but yours are just too perfect. Do you mind whipping one up. We'd all love it like your last one." "You're so tall and strong, do you mind getting that box down." Yup!
5. Make an offering
No one wants to do stuff for free, so even a small bribe *cough* offering, can be enough to get someone to do a lot for you. Present some potential reward or prize for the persons help. A coke, a cookie, getting to leave work 10 minutes earlier. Give them some small incentive to work for you.
6. Give them a choice
People don't always just want to be told what to do. A lot of people will fight this. So, give them a choice and make it seem like they actually have a real one. "Son, you can finish all your homework in the next hour, and we can go out to that Italian place you love, or you take your time and we have brussel sprouts and liver for dinner, your choice." Once you give them a choice, let them make it and leave it alone. Stick to your options as well, even if they choose "incorrectly" this time, they'll learn over time there is no reward in taking the crappy option and will eventually want the better options and you get what you want, in this case, them to finish their homework.
7. If you want the truth...be silent
Want to know who broke the lamp, who messed up payroll, who's cheating on you...give them the silent treatment. We hate long uncomfortable silences. When we make accusations of someone, they are going to get defensive rather than tell the truth, so be silent. Ask the question, and let it rest. Helps if you are sitting right in front of them giving them direct eye contact with no barriers between you as well because that tension and silence becomes unbearable.
8. Ask for it at the end of the day
No, don't wait until your mom and dad or your spouse are in a good mood...wait until they've had a long day and they are tired and are less likely focused or thinking about what you're asking for. They are more likely to just say yes to get you out of their face so they can relax or go home for the day.
9. Give them, "the Nod"
Nod in the affirmative during your question. "We want to (nod) get this paperwork done by noon, yes (nod)?" Even if the person wants to protest, that nod makes it much more difficult to say no. Try it.
10. Shoot for the moon
This is a classic strategy. Say I need $10, and I'm going to attempt to get this from a friend. If I say, I need $10, they, being a friend, may give it to me or they may say, ugh, 10, I don't really, can't, I don't know, whatever. So shoot for the moon. Ask your friend for $30. Your friend may actually say yes to the 30, and you have 20 extra dollars, but most likely they'll balk at that number or realistically not have it on hand, so you say, how about $10, I could still use 10. They see that as a bargain coming down from 30. It's more realistic to them and they can part with 10, and you've got what you needed.