hmm, lets be creative here..
I would run up to a urchinfist with a rubberband and take his grenade (since they take forever to throw) and then blast the urchy in the head with his own grenade..lol!
I would put the potato on the rubberband and stun a seabeard with it, and then stomp on him repeatedly, then I would go steals someones Cutlass and send them to Davy Jones Locker