He probably thought his immune system had built up a tolerance to danger.
(
Dr Preference AjcuiVd289, Mon 20 Jun 2011, 19:52,
archived)
Probably could have done with his car building up a tolerance to walls.
(
Amorous Badger NAKED BEA ARTHUR PHOTOS 4U, Mon 20 Jun 2011, 19:58,
archived)