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Next time you are at a comp or the beach or whatever on a hot day and you have drank all your liquid refreshments, try this trick:
in your cooler, add ice, water and a couple cups of salt. the salt melts the ice, and lowers the freezing temperature of water. a six pack of hot canned liquid will reach 35 degrees in 5 minutes as opposed to 37 degrees in 15 min with just ice and water. pretty cool.

if your real impatient just take your beer bottle and slowly roll it around in the ice water for a couple minutes and it helps too