Sudocream cream.
Infected arse hair follicle.
Walking along a track pretending you are riding a bike along it.
When riving along and seeing a manhole cover you ease the throttle / lift you weigh up slight up slightly in a subconsciousnesly manor as the wheels pass over it.
Seeing a man with a big beard makes you think of Sheldon Brown.
Buying parts secretly like an alcoholic hide their drinking.
Having an old bike or frame that you will not throw away for scentimental reasons.