Fundead

Can't remember if I knew this already, but: some TV shows cling to the laughter of the dead, re-using laughter tracks recorded from studio audiences now at least partially deceased.

a few all-time classic tracks recorded in the late 1950s and early 1960s were never retired, and can still be heard on 'Frasier'

Even more unsettling is the existence of the "laugh machine" and the "laugh men."