This is why I love Tim Conway and Harvey Corman, it's so clear that they love what they're doing, and Tim is clearly just trying to make Harvey laugh, like the scene is just secondary to making his partner embaress himself on screen. And Harvey is clearly trying to keep it together, but can't, especially once Tim loses the use of his leg. This is what makes me want to do comedy professionally.
However, for all that I love it -1 for being filmed off of TV.
OK, I promise that this is the last intelligent, serious and smarmy sounding comment I make for awhile. Back to making snide references to Gilligans Island while watching video of people getting hit in the crotch!

His laugh is so infectious.