This happened at the age of 18 when I was trying to be vain and look cool:
I was on a
packed bus wearing a very tight pair of jeans. (I was feeling trendy) The bus was aproaching the town centre, I rang the bell to indicate that I wanted to get off at the next stop.
I was seated at the back of the bus and stood up to get to the front. To my horror I felt and heard a ripping noise

I realised that my jeans had split from the back to just about the zip

I tried to ignore the giggles as I removed my jacket to cover my rear
I had to get another bus back home so that I could get changed.
At least I can laugh about it now
