This Game Of Thrones drinking game will get you drunker than Tyrion
If you follow the rules in the next episode, you will truly be drunk. You are supposed to chug it if:
The wall is destroyed
A main character dies.
The white walkers arrive at The Wall
Jon learns about his heritage.
Jon and Daenerys get it on.
Arya kills someone.
Spoilers after the jump. Don't read if you want to be surprised on Sunday.
You can bet the farm that several of those things will happen, and the ones which are not fully accurate will be pretty close. (The wall may not be destroyed, for example, but it may be breached. Jon Snow may not learn about his heritage, but viewers might. And so forth.)