Common practice in New Zealand, observers of Don't be rude Wednesday refrain from saying offensive things to people on Wednesdays.

See also: Don't be a cunt Thursday, and Don't be racist Tuesday
Mate #1 "Fuck bro you need to get a life"

Mate #2 "Bit rude man, remember its what day it is"

Mate #1 "Oh shit sorry! Forgot about Don't be rude Wednesday"
by Slippery Gypsy 69 September 9, 2013
Get the Don't be rude Wednesday mug.