Suggestion - since you're new to coin bending, how about heading out to the garage, grab some pliers and bend a few coins for starters.
Then, regardless of what your dad says, take these pre-bent coins and with a little bit of magical gibberish, combined with a quick sleight or misdirection, 'ring' in your bent coin for the original and you've got a coin bending effect.
Then, if you like the reactions, you can purchase the "Ox" or a 'Quantum Bender' or whatever the coin bending product flavor of the month is.
Yes, you have a utility in your hand (the coin doesn't bend itself)
Yes, you have to remove it from play.