This happened in Mongolia:
On my second day at the research site in Mongolia, Tuuggi (a mongolian college student, also 20) and I went out to do a long radio telemetry day. We covered 40km in just under 8hrs and were absolutely beat as we were getting closer back to camp.
About 2 km away from camp we heard a motorcycle somewhere and turned around to see two guys wizzing across the desert on this old russian motorcycle. It turned out to be one of our horsemen and his older brother, but I didn't know this at the time because it was only my second day there. We sat down in the dirt and sand, me still thinking that these were strangers, and one of them pulled out an unopened bottle of vodka. The other one went over to this old bike and started to unscrew the blinker light. I couldn't figure out what the hell he was doing at all.
He brought the blinker light shell over to us and used it as a glass for the vodka. They poured it out traditionally and the four of us finished the bottle in 8mins! I was timing because that was by far the fastest I'd ever seen a vodka dissapear. So by this time we're a little tipsy, sunburnt, and really dehydrated. They tell us to hop on the bike (of course Tuuggi knows who these guys really are but just doesn't tell me), so we climb on with our packs and everything. There are four of us on this little russian bike with our packs and radio antennas hanging off the side just crusiing across this desert steppe with no road.
We pulled into camp and everyone burst out laughing. Four pretty much grown men on this tiny bike, and we're all just red as hell in the face. Probably one of my best memories from my trip. Someone got a picture of us, but I haven't received it yet.