I am currently reading Pyramids by Terry Pratchett.
I like humour that sneaks up on me slightly after I have read the actual text...
An example: Two embalmers are chatting while preparing the dead Pharoah for mummification. One asks the other if this had been a good King.
The other pauses with a jar in his hand, seeming to give their conversation some thought for the first time.
"Never think about it 'till they come down here. I suppose he was better than most. Nice pair of lungs. Clean kidneys. Good big sinuses, which is what I always look for in a King".