'Another One Bites The Dust' was a massive 1980 hit for the band Queen. But there is a little-known urban legend about the song first circulated by Christian
fear mongers evangelists, who said it contains a subliminal message about cannabis.
The Wikipedia page for the song explains the controversy like this:
In the early 1980s, "Another One Bites the Dust" was one of many popular rock songs that Christian evangelists alleged contained subliminal messages through a technique called backmasking. It was claimed that the chorus, when played in reverse, can be heard as "Decide to smoke marijuana",  "It's fun to smoke marijuana", or "Start to smoke marijuana". A spokeswoman for Hollywood Records (Queen's current US label) has denied that the song contains such a message.
Give the song a listen and let us know if you hear the phrase in there somewhere. We've embedded the song first from Queen's official Youtube channel, and then from another account where the Youtube user has reversed the section in question.