a person i know was a little insecure so he got about 20 coins and rolled them into a piece of paper. low and behold, he was stopped and searched and given a verbal warning about it. it was classified as a weapon. luckily for him it was not taken further.
of course there is no reason why you could not have them as loose change and just grab a handful before you punch a person. especially if in front of you you have nasty looking swine like xerodjehalo. Have another lot in the other pocket to and have them in both hands.