Remember Mr. Wizard?  He had a kids show called "Watch Mr. Wizard" in the '50s and '60s, and another one called "Mr. Wizard's World" in the 80's.

If you don't remember him, he was basically a sweet old man who did science experiments.  But someone posted a montage on YouTube where he's joking around with kids . . . and out of context it looks like he's just a condescending jerk.

By the way, Mr. Wizard's real name was Donald Herbert.  He died in 2007 at age 89.