Post your favorite / most effective tire flattening technique.
 

I'm partial to the little pebble in the valve cap and screw the valve cap partially on method. No actual damage to the tire but it sure does tie up a lot of time sticking the spare on or trying to find a compressor some where.

why would you do that?

Nails jamed under each side of the tire, that way when they pull off them get them no matter what, and the worst part is that it is a slow deflate so the victim is miles down the road by time the get the flat......

Bazooka. Instant.

remove the valve needle from all 4 tires...