I appreciate that all too well, seeing as how I had a cat named "Thumper" who did that as well. Thumper got his name not because his original owner was fond of Bambi, but because he weighed in at a full fifteen kilos, and he'd thump like a ripe watermelon if you tapped him on the side. Thumper had a bit of fat on him, but he was just plain big: my sister and her family came out to Dallas to visit a decade ago, and I got to watch my then-two-year-old niece ride the cat around the house like a pony.
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