Playing cards were issued to British pilots in WWII. If captured, they could be soaked in water and unfolded to reveal a map for escape.
Most lipstick contains fish scales.
Upper and lower case letters are named ‘upper’ and ‘lower,’ because in the time when all original print had to be set in individual letters, the upper case’ letters were stored in the case on top of the case that stored the smaller, ‘lower case’ letters.
There are no clocks in Las Vegas gambling casinos.
There are no words in the dictionary that rhyme with orange, purple, and silver.