The only people that think April Fools jokes are funny are the ones performing them, or PR departments. I have no idea what sort of pizza that would be, but I don't think it's that subjective.
All the people disagreeing with OP in this thread are misreading them as wanting to somehow ban jokes and humour.
All the people disagreeing with OP in this thread are misreading them as wanting to somehow ban jokes and humour.