I stand by my statement that Cardiff City fans are the crapest passers of a flag overhead EVER. In years gone by I thought it was the lack of a decent crowd but even full stands can get a flag into a crumpled ball within 5 seconds.

Keep it tight, move it slower, if you have an edge pull it AWAY from the centre and most importantly don't let go of it until it is near enough dragged from your sweaty hands.
Rant over.
A good idea though. Always amazed at the number of scarves other clubs seem to sell and get on show in a crowd.