I've seen shoes strewn over power lines for some time now and thought it odd.
At first I thought people were hugely inspired after seeing the Tim Burton film 'Big Fish'.
I have since found out that this is a sign to let people know that drugs can be purchased around here.
Apparently, word of mouth or business cards aren't the norm for plying a trade of narcotics. You must tie the laces of your good sneakers and throw them across the power lines in certain areas to show those in the know that the Pusherman liveth nearby and will pass over the contraband once you've passed over the dosh. Incidently, these one's were photographed by my good self near the corner of Smith and Otter Sts in Collingwood.
Did a google search on 'shoe tossing'..found these;
Personally, I think it's a waste of a good pair of shoes.