Fantastic one I saw on cellphones on tv last night, when you get on an underground train (story was in London switch to subway etc as appropriate) set the alarm on your mobile to go off in 15 minutes. 15 minutes later 'answer' your mobile and speak loudly - watch as everyone wonders how you get a signal, notably, if you are in a financial district, declare loudly about the nikkei or similar dropping shout 'buy' a few times and then make smug comments about being glad not to have missed that one and thanks for the call. Watch all the stock/futures traders get off the train sweating and staring at their now outdated mobiles and cursing the missed opportunity :)

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