First of all, my apologies to my customer, who was as sweet and kind as could be. She has dealt with a washer she has had to replace the bellows several times in a few short years. I own the exact same one and in the three years we've owned it, it has never had this problem and it is only due to dumb luck because I've done the exact same thing.
Last week, I was called out to check out a water leak on a Whirlpool Duet washer. Since this model has a front panel under the main one, I removed it and ran a rinse and spin cycle. Sometimes, these have a nasty habit of clipping the drain hose under a shock absorber, but this one was intact. The customer indicated to me that it poured a good six gallons of water from underneath the machine, but it filled up with no problems; until the water touched the bellows and a quart or two of water started to leak from underneath. I turned off the machine, set it to drain and spin and sopped up the water. Looked underneath and sure enough there was a hole in the bellows.
Fast forward to today. I removed the old boot with a tool for the outer clamp and with some finagling, a phillips #2 screwdriver through the bottom panel for the inner; for about 5 minutes of work. There were no less than 8 cuts in the bellows. Some were on the bottom and more were on the top, but these were not clean cuts. I asked the customer if she had washed keys, or anything else sharp, but the answer was no and the condition of the bellows bore this out. The answer was that her husband washed shoes and these caught on the bellows, ripping them up. Maranatha!