A room full of students - all either drunk, hung-over and/or exhausted - waiting for the lecture to start, looking down on some bloody organs, suddenly starting to sing The lion sleeps tonight (It's Bergfest time which means this behaviour isn't as absurd as it seems).
Off key and too slow, but it didn't really matter.
None of the usual bitching, feuding or complaining.
Just sitting there, singing and being content.
Doesn't happen very often.