What book would you give to a person who has never read comics (or says they don't like comics) to prove to them just how awesome comics can be? Watchmen is pretty dark, full of rape and murder. The nudity in Blankets has been known to offend. Even Bone tu

This is kind of tough. Most of the comics I enjoy usually have some degree of sex, violence or profanity to them so coming up with some kind of all-purpose recommended list is a challenge. Here are some comics off the top of my head which I would suggest that—as near as I recall—don't have any objectionable content. 

Guy Delisle's travelogues like Pyonyang are fascinating reading. 
Big Questions by Anders Nilson
I love Acme Novelty Library by Chris Ware but I don't think it's good for new comics readers.  
Little Nothings by Lewis Trondheim 
Hicksville by Dylan Horrocks
Castle Waiting by Linda Medley
Lynda Barry's comics
Cynical Man by Matt Feazell
Fables by Bill Willingham. 

I'm sure I can think of more but this is a start. Anyone else have something they want to suggest?