You can't beat Burglar Bill by Janet and Allan Ahlberg! That's an all time classic...
Dogger by Shirley Hughes too, has sad parts and funny parts.
I used to have a fantastic book called "Old MacDonald had some Flats" - I think it was an American book. It was one of my favourite books - about a caretaker in a block of flats who found the tenants too much like hard work, so he brought in veg and cows and things to replace them with. Really charming and funny, and great drawings.
Another good one is Puddum, the Cathcart's Orange Cat. I can't remember the author.