Crazy Man's Handcuffs is definitely a trick to know. Rubberbands can be found most anywhere, or, if you want to carry your own (to make sure you have the right size at hand and such), they take up little to no pocket space. CMH is also one of those effects that just kills the spectators. Mainly because it is so simple and disarming - rubberbands simply cannot do that!
This last weekend I was at the Houdini Days festival in Appleton, Wisconsin. I got into the close up tent early, so that I'd have a good seat (although, I sat second row from the front so that the laymen could get the best seats - that's only right). Just to make you guys' mouths water, the line up was John Stetson, Doc Eason, Bill Malone, Joshua Jay and Michael Ammar.
Anyway, Michael Ammar used me to hold the one rubberband when he did CMH. I gotta tell you, it was really impressive, and I do the trick all the time. Smooth, very very smooth. It really looked like magic and, again, I DO the trick!
On a side note, Pinnacle is pretty impressive too. Again, good impromptu because most any bands will work.
Mike.