I don't know if they still sell them, but I seem to remember that London underground used to sell knickers emblazoned with
'Mind The Gap'.
(
Je suis un vagabond is an unfunny, up your own arse middle class knob,
Wed 26 Jan 2011, 12:27,
archived)
Y fronts
I remember seeing some with a trumpet on the arse with "The Sound of Music" written underneath.
(
Mackeson_drinker,
Wed 26 Jan 2011, 12:33,
archived)