Ask HN: Which software can make you laugh?

I'm interested in humour produced by software experiences, as opposed to the transmission of humour via computers.

I'm aware of the academic study of Computational Humor and some of its results and also some "humorous" games (though these tend run out of laughs due to repetition of the material).

I'd be really interested to hear about software that has and, ideally, still does make you laugh, especially if this is part of the UX of a tool.

Thanks.