Today, me and my friends did some maths to find out what beer would suit us best.
So we thought: IF we buy two 5.0 (a german beer) we can give the empty cans right back and receive 25 cents each, which means we can buy 1 1/2 new cans, as we can give this one backaswell. This means we get 3 1/2 for the price of 2.
If you now buy 4 cans, you have 7 cans of beer, if you buy 8 you've got 14 ...
Perfect excuse ... "Just testin' maths, old maa'm" *BURRRP*