Irn Bru is a popular Scottish soft drink ("Scotland's other national drink") made from sugar, food dye and little else. It's basically the opposite of mineral water.
To Non-Americans: The Chicago Bears and the Green Bay Packers are rival teams. Packers fans normally wear hats that look like slices of cheese. I don't think I need to explain the rest of the joke.
Edit: Here's a picture of the hat:
If you're wondering why they wear cheese hats it's because Green Bay is in Wisconsin and Wisconsin is known for their cheese.
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