Another forum I'm on has a few of these 101 uses topics, thought I'd start this one up!
Number 1. Attaching tent to offset pegs on concrete or other hard surfaces.
Had some friends visit for a few days and put them up in the CT. having had the thing set up for another group of friends a month or so ago, decided to move the set up location a metre or so to give the grass a chance to recover. You guessed it, misjudged the distance to the pathway

Managed to get one corner peg down thru the crack between 2 blocks, but the other corner was stranded.
Thought about roping the tent to the peg, but then thought, hey, heavy duty occy strap in back of
Tug that usually holds the fridge in place!
Put it in place, 4 days later, hasn't moved an inch. Think I mite get a few more to use on a regular basis as I often find I have to re peg the corners down to compensate for floor surface movements.
Any other uses out there?