For charity :)
As part of the Glazen Huis - Serious Request action for the Quintus house fraternity/student organization of Leiden University, you could pay money to have your bicycle decorated or "pimped." (The word fraternity is a bit of a misnomer, Dutch fraternities are co-ed.)
Anyways, I went by on Saturday to see how the Pimp Your Bike action was going.
Inside, in an unventilated bicycle parking and storage area...