Question
I've seen some light hearted pitch decks before, and as someone who appreciates comedy, I enjoy that... but I often wonder what an analytical minded or more money motivated VC/investor thinks when they see rap lyrics or cheeky humor in pitch decks.
I know this is an extremely subjective question, so I'm hoping to get some input from some investors/vcs/angels rather than entrepreneurs.
Answer
Personally, I would not use humor as you never know who is reading the deck. I suggest being succinct and to the point. The quicker to the point the better.
Good luck!