Why are shoes hanging from wires in Cardiff?

Have you ever walked down a street in Cardiff and noticed a pair of shoes dangling above your head?
Footwear can be seen hanging from wires in many places around the world, and the phenomenon is particularly prevalent in Cardiff.
A trip down Salisbury Road, Wyeverne Road or even Queen Street in the city centre allows a glimpse into the strange world of shoe-tossing.
We decided to ask the people of Cardiff for their theories on the meaning behind this urban mystery.
Do you know why shoes are hanging from wires in Cardiff? Tell us your stories in the comment box.