I just came across this lovely video of Raquel Welch covering Bang Bang - she doesn't have the voice for it... or the moves to be honest but she does look rather special... and I get the feeling that deep down she knows she's not that great but really doesn't care!

And here are some better versions

Cher (1966)

Nancy Sinatra (1966)

Nancy Sinatra with Billy Strange (1967)

Dalida (in Italian)