Heard this from a SWA a&p mech...
Working on the avionics and removing a couple of the blanks (blank space covers where additional avionics could be installed), I was surprised there wasn't a rolled up porno in there. That's when I looked at the backside of the blank and there was a red and white placard sticker, "MEL'd No Porno!"
Haha... Maybe should have been NEF? Haha.