Nickels may purchase less, but weigh more on a mugger's mind...just my $2 worth. I've also used a rolled-up newspaper as cause for indigestion in muggers.

I prefer cash.
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein