Probably because that's the first word that comes out of your mouth when a dinosaur knows how to open a door!! Look up in pilot terminology; "JC maneuver" LOL!
Fire up the barby we have a guest to eat.
Monitor lizards that are pets can be taught to follow verbal orders from their owners, just like dogs. Of course these are taught to follow directions from when they are small, and not adult jumbo-sized monitors.
The reptile brain is quite different from the mammalian brain and I suspect they learn better when young. Then again, there is that old saying, “You can’t teach an old dog new tricks.”