Goatse was my first thought.
But I'd much rather believe he's playing an invisible harmonica. Please be so!
(
cowcat Bituminous squeegee,
Wed 1 May 2013, 4:09,
archived)
Yay!!!
He's concentrating very hard.
(
cowcat Bituminous squeegee,
Wed 1 May 2013, 5:54,
archived)