@TheKidInside: Yeah dude, he was (maybe still is?) a death metal fan. There's a video on youtube of the band talking about their experience on the set of the movie; they said Jim Carrey knew all of their songs. Pretty trippy to imagine a guy like Jim Carrey getting down to some death metal.
(Here is a link to the video if you care to watch, but are not legally obligated to, lol) CANNIBAL CORPSE - ( JIM CARREY ACE VENTURA ) - CENTURIES OF TORMENT DVD 2008 - YouTube