The art of comic timing

Here's a wonderful clip about old age: 90-year-old Mel Brooks reminisces about his friend of half a century, Gene Wilder, who died this week at 83.

But it's more. Watch Brooks start fiddling with his hair. It's not just an old man worried about his combover slipping out of place.

It's a long, subtle setup to a brilliantly,-executed gag.