I've had one random hookup that actually involved sealing the deal so to speak, but the best story involved no sex.
I was in Mexico earlier this year, at a resort. So I'm in the night club, and this cute eighteen year old from Georgia is flirting with me, and I'm flirting back. Eventually we start making out, enough that we get kicked out of the night club, so we're sitting outside of it. We keep getting drinks though, and she says some of the weirdest, nonsensical things, ranting about psychology and such. Eventually she ends up so drunk I have to almost carry her back to her room. She falls several times along the route and her mother, who unbeknownst to me was at the resort, is livid and I make a hasty retreat to my own room.
And so while I was warned, I have now learned first hand that meeting Americans who have unrestricted access to alcohol, while underage in their normal state, is just going to end poorly; so hit on the hot Canadians instead (and damn, we're hot)