In 1966, Hanna-Barbera decided to dip its toes into the pool of classic literature adaptations. They released unto the public Hanna Barbera's Alice in Wonderland or, What's a Kid Like You Doing in a Place Like This?

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Do you know who sings these Flintstones songs?

The movie follows a 1960s Alice who needs to finish her school book report on the Lewis Carroll novel. After she takes a nasty fall playing with her dog, Fluffy, she follows him through her television screen and enters Wonderland.

The TV special boasted a slew of popular voice actors and characters that delighted and surprised audiences, including Sammy Davis Jr. singing the role of the Cheshire Cat (and the title number) and Zsa Zsa Gabor voicing the Queen of Hearts. However, no two characters were as easy to recognize as Fred Flintstone and Barney Rubble.

The iconic best friends appear about midway through the special, playing a two-headed caterpillar. When Alice inquires as to why there are two faces on the single caterpillar body (more like a two-person costume), Fred gives her the obvious answer.

Hanna-BarberaBarney and Fred as a two-headed caterpillar.

"Haven't you ever heard of the expression 'Two heads are better than one'?" he says.

"Well, we're two heads; we can see where you're going and where you've been at the same time!" Barney adds.

The two then break into a rousing number (complete with straw hats and canes) and show off their act, Fred & Barney: Songs and Blarney. Longtime Flintstones fans may remember the buddies sporting a similar getup in the popular episode "Ann-Margrock Presents." But do they help to find Alice's sweet pup Fluffy?

"Sorry, m'dear, but we don't work with animals!"

Classic Fred. No matter what they get themselves into, one thing is for sure; Fred and Barney are definitely best friends, and that, as their song says, "will never change."