The line comes from The Mask, the 1994 comedy starring Jim Carrey as Stanley Ipkiss, a bank clerk who finds a magical mask that turns him into a wild, cartoon-like trickster. In the scene the Mask is run over, peeled off the pavement in a flat shape, and proudly shows off the result before laughing. Clips and audio rips circulated on video and soundboard sites in the 2000s and 2010s, and the short call-and-laugh structure made it easy to reuse as a reaction for animated violence, gaming deaths and real life tumbles that look worse than they are.
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Jim Carrey as The Mask delivers the Look Ma I'm Roadkill line after being flattened, now used as a comic reaction for fails and wipeouts in videos.
This is Jim Carrey in full Mask mode, cheerfully announcing Look Ma, I'm roadkill after being run over and flattened like a cartoon. His voice is stretched, manic and gleefully unbothered, followed by a loud ha ha ha laugh that sells the joke. The humour comes from the contrast between a gruesome image and his proud, kid-like delivery, as if he has just done a clever trick. Played over a fall, crash or embarrassing defeat, it instantly turns pain into slapstick and tells the audience the character is somehow fine.
