I'm really glad I don't get hangovers.
My worse one was getting drunk when my little brother was home with me. I had nothing to do the next day, and I wasn't required to go anywhere, so I got a half sack of weed and got something... disgusting from the liquor cabinet. I reached that certain point where no matter how much you don't like the alcohol that you're drinking, you stop caring about the taste. That's a very dangerous point for me, because at that point, there's no longer anything holding me back from drinking copious amounts.
The vomit came unexpectedly, and I had barely made it to the bathroom before I ended up throwing up more than I even drank. There's something very dark about having a bad trip on weed, and being to drunk to even stand up, and on top of that being paranoid that your little brother is gonna rat you out. It's just not a pleasant experience. It's a really dark time.
I ended up just getting a blanket and sleeping on the floor of my bathroom, waking up extremely dehydrated.
Edit: Also, don't be the person that mixes alcohol with energy drinks. You don't really realize you're drunk because of how much caffeine you're getting, and it's one of the worst things you can do to your body.