At my mom's house I typically use the central vacuum for most of the house and my mom uses my Hoover T Series in the basement (where her room is). My mom knows how to take care of vacuum cleaners, so I was surprised when I went down there and found the container completely filled into the little plastic tube going to the hose. I asked her about it, and found out that her fiance (they broke up recently, so he's no longer her fiance) had vacuumed a few times, and apparently he's too lazy to take it to the trash can and push the button on the back of it. So I had to take it and clean it all out, while doing so I found a clog in the hose that was started by bits of styrofoam.
I have a hard time believing that so many people don't take care of their vacuum cleaners, and I realize that it's more than just vacuums. People don't check their A/C filters, car oil, security alarms, or smoke alarms. Even my grandma just recently learned that vacuum belts have to be replaced more often than when they break.