A few other shortcuts: Face-painting (Though I've never and probably will never do this, I can't believe that it doesn't make you love a team a little more. Start with some adorable eyeblack and go from there.), finding one super-fan friend (their enthusiasm will be infectious, though losses will probably require Prozac) and, as always, alcohol (don't overdo it—it's a real rookie move to not know who actually won the game).
Best of luck, and may your team not break your heart too much.
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*Note: I have yet to take a loss anything but personally. I think this is the year, though. I have low expectations.