Here is a nice one...

tell your mark that they WILL say 74....they insist they wont..

ok.....bet them a drink....

tell them to add 2 and 2....then 4 and 4..then 8 and 8..then 16 and 16..then 32 and 32.....they will say 64....you say..there you go, you said 64! they say..NO you said 74....
you say..i told you, you WOULD say 74....take your drink..

regards

geoff diamond