I can recall a couple from work. I should point out this is office humour, so it doesn't actually have to be funny.
I arrived a couple of minutes late for work the other week, as I usually do. One guy on the next team said 'You'd be late for your own funeral', to which I replied 'Well, I'd be late at my own funeral'. He didn't get it but a few others smiled.
Back at a previous job, I was working for the police in their speeding ticket office. One day we were sending out the notifications and we noticed one was for a Chinese person named Ding Dong. I immediately deadpanned 'That name rings a bell', to the groans of all present.