I've probably done stupider things while sober than while drunk. I tend not to be a stupid drunk, plus the fact that it takes me way too much alcohol to get that drunk. Which, by the way, is a mystery to me because I do not drink very much so it is not an increasing tolerance thing. Maybe it's my hypermetabolism and my hollow leg.
The most interesting thing I did while drunk was in St Petersburg (the russian version, AKA Leningrad). Had lunch and had about 8-10 vodka shots (because they kept refilling and I drank other peoples at the table because I thought we were being rude if we didn't drink it - I am sensitive to other cultures 😉). Then after that we toured The Hermitage. I still remember everything, and I did not embarrass myself at all. But it was definitely interesting because the paintings were somewhat in motion.