Not quite a dent this time but a chip/cut/deep scratch on my aluminium frame.
Long story but my lock got cut and I managed to retrieve the bike. It now has a cut in it that I'm guessing was either from whatever they used to cut it or from the back of the guard rail it was locked to.
I could be making a deal out of nothing but I've also heard horror stories so just want to be careful.
Cut is maybe 1-2mm, paint could be making it look deeper but it's definitely deeper than a lot of the other chips on the frame.