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A regular tattoo of Lionel Messi probably crosses the line of normal behavior in appreciation of Barcelona's superstar.

But darting to a tattoo parlor to permanently seal his signature on your leg, well, that's a bit cuckoo. Yet, that's not such a big deal for  Matías Tacarías.

The Messi superfan engages in a number of fanatical pursuits involving Messi, including following him around Barcelona to training, games and the airport just to get a glimpse of the player and a handshake -- which Messi obliges more often than not. 

Then there is the song that Tacarías wrote and performs for Messi, with music video included. Let's just say Shakira won't be calling up Tacarías for a duet anytime soon. 

But that's just part of Tacarías' story as Jamie Easton explains.