A sign that read "Bicycle Parking 'Forbudt'" Forbudt meaning Forbidden.
Some clever soul removed the appropriate letters so that it now reads:
Bicycle Parking Ahead, or In Advance.
If a cleverer soul came by, they could put and 'H' in between the 'R' and the 'U' and it would read:
"Bicycle Parking Foreskin".
Amusing, perhaps. Funny. Like haha funny. Innit.