I would say it depends on the moment. I would say John Irving, Neil Gaiman and Peter David all have moments if only once or twice through an entire book. Mind you, I can make people laugh easier than they can make ME laugh.
I love the way Saira Viola author of SLIDE uses language one of my favorites : " She wore wrap around Gucci shades and a poisnous frown . Even the derma fillers injected into her smooth veneer cuoldn't mask her over dramatic angst ".
I met Kurt Vonnegut many times when he was alive. He also lived on Cape Cod.
The first time was in 1976 when he allowed the Barnstable High School to perform a stage production of Welcome to the Monkey House. I had friends who were in the performance and we all went to his house afterwards for a cast party.
Robert B. Parker's Spenser novels almost always make me chuckle in spots. He was dry, yet witty; Spenser' one liners are always great. As you may know, Robert Parker died suddenly yesterday; he will be hugely missed by his readers.
Also, Jan Karon's, The Mitford series. Her characters are charming, warm, very human and make me laugh outloud at times.