* A Mixer
* gamble on one of many online casinos
* buy physical darknet goods with them
* Hack someones account on an exchange and use it.
* The above, but use the coins to 'pump-n-dump' a tiny altcoin. Be one of many 'investors' making money out of the change in altcoin price.
* Go margin trading with them, but make sure to loose them all in a margin call. Do it on a small altcoin so you can be on the other side of that margin call.