In January 2017 I went on holiday to Barcelona. Armed with only my laptop (and after finding myself alone with lots of free time) I decided to join a 48 hour game jam that happened to be on near where I was staying.
I found a programmer, audio engineer/musician and an artist, and we banded together for the weekend to hack together a 2D space shooter.
Considering I didn't know anyone before the jam and only spoke basic Spanish, the project went really well. It turned out to be probably the most polished game jam project I have made to-date.