Some mistakes you do over and over. Like dating a super hot guy who's a bad boy, or enjoying one too many Mimosas at brunch on vacation. But some mistakes are so memorable you only make them once. Here's a go-to list.
Palmolive in the dishwasher
They used to make liquid dish soap that was unsafe for the dishwasher. Remember the soap that mom kept next to the kitchen sink? I did this once. And this is what happens.

Enough said. The best part is you then spend hours trying to mop it up, because the bubbles turn into exponentially more bubbles after you add additional water. Hand washing is not a bad thing when it takes you 1 hour plus 8 to clean up a dishwasher.
Ordering seafood at a diner
Ever heard the phrase "you get what you pay for"? Don't buy the endless shrimp hoopla! My cousin in law once ordered clams casino from a diner. We will never know why. He spent the next 24 hours regretting it. We spent the next 24 years making fun of his poor decision. 
Dating someone you meet at a costume party

I did. They were dressed like a plumber. They looked way better in the plumber costume then they did in real life. Like waaaayyy better. I suffered through an awkward date. This is almost worse then a blind date. Its akin to dating someone online who has an airbrushed photo. I don't need an Adonis, but someone who doesn't have plumbers crack every day would be nice. After that I've only dated people I've seen in real life.
Cutting your hair post-pregnancy
People tell you to wait until after the hormones are normalized to cut your hair, but after the first every women I know has done this one, thankfully only once! Lobbed it all off into an unattractive do that only a baby or blind person could love.

They honestly should have a law at the salon that if you come with a baby under 6 months or show a photo of a newborn you are automatically denied anything other then a trim.
So what mistakes did you do but only just once?
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