There is a hidden message in the song “Still Life.” When the song is played backwards, Nicko can be heard making fun of actor John Bird's impression of Idi Amin, saying, among other things, “Do not meddle with things you don't understand.” The band put it in as a jab at critics who accused their songs of being Satanic.
IRON MAIDEN was getting really fed up with the American bigots who'd condemned them devil worshippers
and such, so they decided to stick this sucker on the new album (PIECE OF
MIND). Right at the beginning of the song Still Life is two quick backwards
messages, one after the other. Both are spoken by Nicko in a deep Rasta
accent, not too much even understandable even when played backwards. Well,
the first says "What ho sed de t'ing wid de t'ree bonce", which means "What
ho said the monster with the three heads." The second says "Don't meddle wid
t'ings you don't understand." And of course, the message ends with a belch!