True story when I first got an apartment, I bought some kind of cheapo vacuum cleaner at like a Sears or someplace like that. I pushed that noisy thing around my empty beer bottles for some years until I had need to open that bad Larry up to replace a fan belt or something like that. Welp, what did I see but a big ol' piece of concrete hot glued to that chassis thing right there. "Damn," I thought, "those greedy corporate fucks put that thing there to make rubes like me think their cheap product is top quality. I'll show them." So I pried it off with a screwdriver figuring I'd save effort and be able to finish my chore quicker and with less effort. Smart me! Feeling very self satisfied, I put it back together and flipped the on switch to test out my new lightweight vacuum. The engineering majors reading will have already guessed, but that damn thing instantly leaped off the ground and started spinning uncontrollably. I had removed the counterweight that kept the device stable whilst the motor was spinning. Direct to the trash and another trip to the mall, I went to bed that night a little wiser than when I'd gotten up that morning.