Stupidest thing I've ever done on or with a bike?
Met up with some gals on the rail trail, started chatting with them while we rode, ended up riding 40 + miles when I'd only been riding about 15 max up to that point (uphill I might add), and rode for about 10 of those miles with knee and hip pain that just about killed me before I had the good sense to ask them what might be causing it. Turns out it was my seat height that they helped me adjust. I could barely walk up the steps when i got home and couldn't walk very well the next day.
That hurt!
Gray