Much needed rain,
Cleaned gutters and downspouts before said rain,
The wife and kids out of the house for at least one of the games (Dad, who's #12? Dad, who's #88? Dad, who's #72? Dad, who are the guys in the blue shirts? Dad, can we watch cartoons? Dad, when is the game over? Dad, will you unlock the basement door so we can get out?),
A plasma TV,
Having the two games I want to watch playing back to back.
Quality jerseys to watch the game in, although the GB #4 jersey is retired and will be replaced for GB games with #50 AJ Hawk.
I love the feel of quality jerseys - sewn on letters and numbers, heavy-weight fabric, etc. Well worth the extra cost, in my opinion.