Possible Clues:

• Even odds
• Where neither is more likely to lift alcoholic drink
• Game show question that determines which team plays
• It can go either way
• Bit of change in the air? It could go either way
• Even choice
• Fifty per cent chance of drunk returning drink
• This will resolve drinker about drink
• Penny perhaps involved in this decision making process
• Quickly prepare large drink on time