So, I was watching Have Gun Will Travel (or HGWT, as the kids like to call it) on Netflix last night, and there was an episode called "Last Laugh" which featured a simple-minded character named Jud. Jud was portrayed by an actor named Peter Whitney, who apparently did a lot of character work in '50s and '60s TV shows, especially westerns. I bring this up because...well, look at this image of Whitney from another role:
If I was more tech savvy, I'd screencap some of the images of Whitney as the hapless Jud from that HGWT episode, because they look just like Jeff doing his famous "Dumb Guy" impersonation.
Here's another Whitney image just for kicks: