Which Has More Caffeine?

Let's find out how well you know your caffeine contents.

1 of 8
Coke (12 oz)
Diet Coke (12 oz)
2 of 8
Starbucks Coffee (16 oz)
Dunkin Donuts Coffee (16 oz)
3 of 8
Glaceau Vitamin Water
Red Bull
4 of 8
5-Hour Energy
One Excedrin
5 of 8
Starbucks Espresso (1 oz)
Hershey Bar (1.55 oz)
6 of 8
Dr Pepper (12 oz)
Tab (12 oz)
7 of 8
Maximum Strength No Doz (1 tablet)
Four Loko (23.5 oz. can, before they nixed the caffeine)
8 of 8
Xantrex Diet Pills (1 daily dose)
20 Cans of Mountain Dew (12 oz. each)