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The two came out singing Sia's Chandelier before Carrey began joking about catching ebola at Coachella as he ran around on stage wrapped in a scarf.
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That wasn't such a good idea as the 52-year-old actor backed up a little two far and fell backward off stage.
MTV
Carrey was soon back on his feet though and the duo played it off.
"Dumb and Dumber To" is in theaters November 14.