Aerotow incidents.
A couple of years ago. Busy aerotow queue. The chap with the cable was chatting whilst attaching it. to my glider.
Brakes closed and locked, up slack, all out. At about 40knts we lifted off and the brakes immediately popped open dropping us back on the tarmac - which closed the brakes again.
This repeated about 4 times before i pulled the release. The tug hadnt reached flying speed all through this.
No danger, no damage just my very red face.
Memo to self - DO NOT allow myself to be distracted whilst doing checks. Air brakes were closed but not locked.