Thongs!
Used to wear them a lot during my uni years purely because they were comfortable (for short periods of time), cooler, didn't show up against any pants or shorts I might be wearing, and were of course rather sexy etc.
However, there are many downsides, most of which I won't repeat here. But needless to say they are quite literally a pain in the arse (and elsewhere!), especially when going for a long jog. People must think when I run past them, I have a twitch or muscle cramp down below because I run like I've got a hand brush wedged between my thighs!
Keep meaning to throw the last remaining 3 out, but keep forgetting - until now!
Goodbye, wedgies. Thanks for all the brief grief!