Did Van Gogh Have a Sense of Humor?

I was reading one of my local library's biographies of Henri Toulouse-Latrec called The Tragic Life of Toulouse-Latrec (Random House; 1956) by the husband and wife team of Lawrence and Elizabeth Hanson.  My eyes widened as I read that Vincent Van Gogh "was without a sense of humor" which made him an unlikely companion for the witty Toulouse-Latrec.

Really?  Without a sense of humor?  Granted, his letters to brother Theo that have survived do not offer a lot of yucks.  But we are still talking about a man who did this oil painting, "Skull of a Skeleton with Burning Cigarette" (or, in his native Dutch Kop van een skelet met brandende sigaret).  This was done in Antwerp in 1885 or 1886.  The latter was the year Vincent moved from Antwerp to Paris.

Vincent apparently read French and understood French being spoken to him much better than he spoke it.  This may have caused him to appear humorless and a bit stupid to the Parisians.  Lawrence and Elizabeth Hanson state that Vincent stuttered when speaking French, but I haven't seen this mentioned in any other biography ... other than the one written by the Hansons, Passionate Pilgrim: The Life of Vincent Van Gogh (Random House; 1955.)