It’s getting a square peg out of a round hole that’s the trick. The reverse is probably harder.
A woman took her child to the zoo close to Christmas Time. They got to the monkey exhibit where the zookeepers had put nuts in bowls for a Christmas treat. The woman was grossed out by one monkey who would take a nut from the bowl, stick it up his rectum, remove it and then eat it. A nearby zookeeper recognized the woman’s reaction from the look on her face. He told her, “well ma’am, it actually makes some sense. A few weeks back a visitor tossed him a peach. He ate it whole and couldn’t pass the pit. Now he tries everything on for size.”