The last thing you bought

A cam of Monster.
 
I was at the A's game on Wednesday. I bought:

2 tickets on BART (Bay Area subway-like thing)
Hot dog
Fries
Mtn Dew
Dibs (ice cream covered in Nestle's crunch)
 
realMYST because Steam finally came to their senses and released Myst.
 
My brother bought Gratuitous Space Battles over Steam. Personally, I don't get it, but oh well.
 
Back