I was victim to a couple of "keggings" where someone would try and pull both your trousers and your boxers down in front of a group of people. It happened nearly all the time in P.E when everyone was wearing looser jogging bottoms/shorts. The protection to this was to tie the string as tight as you could (I didn't have this string for quite some time) and shove your hands into your pockets and grab as tight as you could to stop them being hauled down. The first one to me was feeble, by this extremely large, oafish twat while we were waiting outside the changing rooms, and he only managed to pull them down a little, and didn't get the boxers, so I was lucky. The second time I wasn't so lucky... We were playing Basketball and this evil crap came up behind me and pulled both my trousers and my boxers down. I don't know how but no one witnessed this, which I was very glad of. I don't think I've ever been so scared in my life.
Because I've been a big big pussy over the years, I did nothing to defend myself, which I regret oh so much.