Home is where the fan base is.
When your team wins, no one around you cares.
So you spend a lot of time racking your brain (and phone book) for the friends who want to watch the game with you.
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When your team is playing the local team, you feel like your gear makes you a walking target.
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SBNation
So when you see a stranger wearing your team's gear, you acknowledge them like you would a family member.
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MLB