There you are, doinking around on Facebook while your wee one watches cartoons when you hear it. A voice you recognize but can't quite place. YOU KNOW THAT VOICE!
You're totally not crazy. Many famous faces lend, or have lent, their voices to the animated screen, bringing characters large and small to life.
Voice acting is actually a lucrative career, one in which Rachel Frederickson, The Biggest Loser winner, worked before becoming a tabloid celebrity because of her dramatic weight loss.
Some got their starts that way, while others retreated to the world of animation when their faces were too famous for them to play any other roles.
Scroll through 21 celebrities who have voiced cartoon characters and see which ones you recognize immediately, and which come as a total surprise: