I'm not easily amused, but I often found him hilarious, particularly when he did the Elvis thing.
It's not necessarily "humor" (although Rich Little and Frank Gorshin might argue), but I recall watching some network show back circa 1976 where they introduced "Elvis" as their special guest (I was dumbfounded), and it wasn't until the closeup that I realized it wasn't the genuine article.
:) We can agree to disagree. :)