[Astyanax]

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grunch: sell on eBay, buy 3 together at the stadium

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this is surely the best advice.

Or...plan for someone who is unknown to your two friends to mug you with a knife (obv a blunt one) when you are together late at night.

See which friend reacts straight away and comes to your defences and see which one makes excuses or runs or whatever. If they both are about to fight the sell the tickets and take em both - if they both run, get some new friends and take the mugger!