marijuana is pronounced (at least by me) /mæɹəwɑːnə/.
Backwards this is /ənɑːwəɹæm/ (roughly "anarawam") which sounds strangely close to "another one" /ənʌðəwʌn/.
I've long wondered if this is why people think that Queen's Another Ones Bites the Dust talks about smoking marijuana when played backwards.
Of course, this is a potential (non-visual) Forced Mondegreen but it even works in the forward direction too. There are times in the song where it sounds like Freddie is actually saying "anarawam" rather than "another one".