Magicdiscoman,
You shouldn't mention sterling coins to a Scotsman. He'll be thinking of the city
Despite what I say about using normal things spectators are used to seeing, hopping halfs is the only effect I use that contradicts myself.
I use the original version used by Hobson, the old English penny and the American half dollar. I talk the spectators through the coins explaining that one has the Queen on one side and Britanica on the other and is minted in mostly copper and that the other coin has Ted Kennedy on one side and the American Eagle of independance on the other. Also, it was the last US coin minted with real silver in it and that it is also unique in that it has a bronze edge to it. Its all bulls**t but its a story.
I keep going through that as the routine progresses and it emphasises that they always see both sides of both coins. On the final time I start the usual dialogue and then interupt it and say, Oh, I'm not going through that again.
Then the big finish. Excellent effect. I haven't used the other versions but the English penny and US half dollar certainly work with a good story
AND because they are not standard coinage you do not have to pull them from your loose change. If you want to use a UK coin version, don't forget that you have to take the coins out of your pocket full of loose change or it won't be natural. There is an easy way to do that, but that's another story

Tenko.
Yorkshire, UK
Male, 55yrs old, Retired.
"I don't believe it" Luke Skywalker
"That is why you fail" Yoda