They certainly keep us entertained and endlessly guessing why.
Neither of mine do that with their bowls. I feed them out of heavy ceramic bowls (serving dishes if am honest) . Do you think he is checking for hidden tablets

Or replacing the smell of your hands with his scent on the bowl. Curious to know if you've tried different bowl and he still does it.
Btw rolling on his ball, is it playing but also putting his scent on the ball - it's mine? Running off with treat - it's mine! Peeing in the puddle- I was here, my scent. No idea of course but wonder if there is a connection to subtle behaviours.
Fun to ponder what our doods are really up to!