I worked sound for several rock bands and DJ'd many LOUD parties in my life, but I've only cooked one pair of speakers!
1977 - I had a set of no-name speakers with 15" woofers and a new set of mid-priced radio shack speakers. We had a Halloween party and put all 4 on a friend's beefy amp... and cooked the radio shack speakers. I told them the amp was too much for the speakers - oh, well! (The no-name speakers survived until the late 80's when the cones got brittle.)
Fast forward to 2009, I needed a set of speakers for the garage and found a pair of identical radio shack speakers in pristine condition at the thrift store - $5! Powered by a Pioneer receiver I rescued from the recycle, they have served me well and sound great. This Halloween, I used this setup for our Halloween party - the speakers handled it well. So well that my anal-retentive neighbors called the police because we were too loud!