Swimming in underwear
A few times I've been out down at the beach or the lake and not had my swimwear with me so I've just stripped down to my boxers and jumped in, it's no big deal. I don't want to have them on wet afterwards so I'll just end up going commando for the rest of the day.
The problem comes when you start off commando which then means you go skinny dipping which is much more fun
Now that Scotty Boy has had this nice experience he might want to walk around in boxers only more often.