I can touch my elbow with the tip of my tongue and you're supposed to be very flexible and only just a few people can do it.
I realised I could do it one day, when someone mentioned that it was impossible to do that and everybody started trying it without any results.
When they saw that I could do it, they started asking some questions such as: "How can you do it?" "I can´t believe it" they said. They all were very surprised!
I don't really think that's a useful ability, but it's a way to show people that there's nothing impossible.
It's me licking my elbow.