Here's an age old question - if you drop food on the ground, should you eat it? And if you do, how long do you have to pick it up?
Five seconds? Three? Seven? However long it takes to bend over? It's one of those things we all feel funny about. And why?
They generally freak us out - some people more than others. Coughing, sneezing, door knobs, hotel beds, toilet seats, you name it.
Germs can be nasty business and send even the most resilient of us running for cover.
Howie Mandel is a self-described germaphobe. He talked about it quite seriously when he was on the show.
But Howie has also found humour in his irrational fear of germs.
Tonight, he's got a new Just For Laughs standup special on CBC called 'Howie Mandel & Germ-Free Friends' (check out the clip at the top) with a hand-picked lineup including...
The star of 'Mr. D' Gerry Dee, rising star Joe Machi, British comic Hal Cruttenden and musical act J. Chris Newberg ('America's Got Talent').
You can catch 'Howie Mandel & Germ-Free Friends' tonight at 8 pm on CBC Television, right after our show and 'Coronation Street'.
And here's Howie in the red chair, talking about how difficult it is to be so neurotic. He gets into it at the 6:28 mark.