Happy Hour - Call of Duty: Black Ops II

In TranZit, buy 2 different perks before turning on the power - 10

In TranZit, at the Bus Depot, build the Turbine;

1 - Mannequin

2 - Fan

3 - Tail Fin

Then you can power up the Quick Revive Machine and drink the Perk.

If you are playing single-player, you don't even need to power the Quick Revive Perk Machine up.

Then you need to take the bus to the Diner, where inside of the Diner you can power up the Speed Cola Perk Machine and drink it.

There you can have now drank two Perks before even turning on the power.

Happy Hour - A term used for when alcoholic drinks are sold at a discount.

Speed Cola Perk Machine