Hmm, maybe because trying to stay awake/alive and pay attention to a bunch of old women blabber is more painful than a c-clamp to the head?
Other possibilities exist, but, it's probably not so funny unless you've reached old age or spend a lot of time with old folks.
[edit] The other guy in the chair in the foreground is a bit younger, so, maybe he's witnessing the beat down feeling of his dad/realative after years of dealing with the wife and her gang. I'd guess that was Gary and his dad or grandad at some point in time [/edit].