A bridegroom playing guitar's on Cromok's "I Don't Belong Here" during his own wedding.
Intro song : Black Sabbath's Supernaut
Song during jamming : Criminals In Uniform
Recorded during Arise Album production.
Slayer Drum audition during 2002.
It's fun to put effort to what you like.
It's more fun when you can jam it with others, and others playing at their best ability.
I termed the fun and effort as "heartwork"
This ain't jamming. But it's totally spontaneous, not planned, intended to piss people off.