Hilarious question!!! I say, if both hands are free and you can use one hand to steady the paper towel roll then with the other hand you can pull the wanted amount of paper towels off. But...if you are attacking this paper towel roll with one hand, be quick!! Pull and jerk!
That totally depends on whether you buy the very inexpensive paper towels that wouldn't tear apart if you used both hands and your teeth! Or the expensive brands that tear easily! I guess you'll have to figure this one out on your own!