I graduated last year, and my and my fiance's parents BEGGED us to go to the prom. "This is your only chance, in 20 years you're going to regret not going, blah blah blah." My fiance is a year older than me, and we didn't go to his either -- so we got to hear it twice.
...Totally not our kind of thing. The dress was nice, the dinner we went to beforehand was nice, but we only stayed at the prom for about 10 minutes (just enough time to say hi to some friends and have the stupid pictures taken for our parents) before we left. I actually regret going. It was a huge hassle which we had no interest in. We would have much rather spent the money on a trip to the coast or something. Oh well, I guess at least I have a nice dress on hand.