Anytime I hear Cee-Lo pimping out the 'The Voice' or 'Fuck You' comes on the radio all I can think of

[PancakeBrah]

Nirvana's 'Unplugged' isn't unplugged at all. There's various instances, but the dead giveaway is the 'The Man Who Sold the World' cover. That's clearly an electric guitar. Or the use of electric/amp effects.