What do guys like to get for their birthday?

It varies from guy to guy, and from time to time. A lot of times I don't even know I want something until it's given to me, i.e. my girlfriend got me a steel wallet for my birthday. I'd never heard of one but it's the coolest thing ever, everyone that sees it asks about it. If you know your guy just think about the things he likes, combine that with something he could/would use (or even needs), and get him that. My girl knew I liked metal, shiny stuff, silvery colored items, and that I needed a new wallet. It was perfect.

If all else fails, threesomes work good too :)

lol. we aren't a collective mind like the borg! depends on the guy. get him something related to one of his hobbies.