Riddle: If your sock drawer has 6 black socks, 4 brown socks, 8 white socks, and 2 tan socks, how many socks would you have to pull out in the dark to be sure you had a matching pair?
Answer: Five. There are only four colors, so five socks guarantee that two will be the same color.
Source: https://riddles.com/index.php/2603