I've posted this one in another thread but we had one guy who was batting against us and, in between balls, turned to the wicket keeper and asked him what his favourite Haribo was. Everyone was doubled up.
The one I'm most proud of that had the Umpire chuckling away was when I was batting at the non-striker's end playing against a bowler who I played mid-week cricket with. After my opening batting partner had played and missed at three in a row, he was walking back to his mark and said "tell you what Jay, it's doing a bit" to which I shot back "its gotta be the pitch..."
Sadly I tend to hear more abuse than out and out funnys, especially when I used to play in mid week Midlands T20 leagues. I love banter and funnys, can't stand any abuse, especially not at the level I play at...