I haven't watched "My Strange Addiction" on TLC, but I really think I need to start watching. There's a girl who appeared on the show who is addicted to gasoline and drinks up to 12 teaspoons of gas a day. 

She says she likes the way it burns her throat and she can't stop drinking gasoline even though she knows she could die from it. She also likes to lick the gas cap when she needs a break from drinking. She's consumed over five gallons of gas in the last year. This is absolutely disgusting and dangerous, so hopefully she can get some treatment for her addiction.