I filled a buddy's arrow full of sand at a shoot , he was to lazy to pull arrows , his score was slightly affected. 
Off topic, but this brings up a Duke Savora story I can not resist sharing.
Not long after I went to work for Duke he invited me to the Kenmore range to shoot the 3-D course. We were excited to see how our home made "takedown" arrows would do. We had cut 2213 arrows in half and then glued 3" of a split arrow shaft inside one of the halves. All you had to do was squeeze the split arrow and slide the other half on. Was our answer to packing additional arrows into the high country.
Well, little did I know Duke had brought a customized fletching half of an arrow. Fletched exactly like mine. When he offered to pull my arrows while I grabbed us drinks from my fanny pack he made the swap with this arrow that he had drilled a hole in and filled with baby powder. When I shot it looked like the arrow caught fire and was smoking the whole way to the target. I had no idea what had just happened! I must have had a shocked look on my face when I looked at Duke because he could not control his laughter as soon as I made eye contact. He puts his hand on my shoulder and says, "See, I told you those PSE bows were smokin' fast!"
