we’ve trained our cats (one passed away last summer) to sit and beg, not for entertainment purposes, but more so for discipline. When they were kittens, they were absolutely desperate for food and would put their paw on their food bowl and tip the whole lot of food on the floor. Didn’t bother them of course, they’d just eat from the ground! But with treats, they would also have their claws out when grabbing for treats and eat from your fingers. We were concerned that adults or children not used to cats’ sharp claws may find it uncomfortable or distressing and have a bad impression of cats, so we trained them using dog style ‘tricks’ to sit for their food bowls (all 4 paws and bum on the ground, front legs straight) or to ‘beg’ for treats (bum on the ground, but front paws up).