Hahahah, something similar happened to me a time ago. I was waiting for a tram in one of the busiest parts of town and when it arrived one section of it was empty and the rest completely packed. Of course, because of some odour, it was a homeless man that smelled like fermented shit, piss and alcohol combined. Did the same as you and moved to the next section, trams here are connected so no need to get off it to change.