In episode 3, season 8, Chandler made fun of airport security. That scene was cut in USA because of the terrorist attacks.
If anyone is interested, I'm sharing the uncut version of the episode on Kazaa until 1500 (European time).
The filename is "Friends 803 - TOW Rachel Tells - UNCUT - With Chandler's Bomb Remark - PAL VCD.mpg" (219,098 kb).