Crossword puzzle clue "something tells should've stayed in bed"

"Something tells __ should've stayed in bed"

Who quipped "God tells me how the music should sound, but you stand in the way"

George Bernard Shaw wanted his to read "I knew if I stayed around long enough, something like this would happen"

Wondering "Should I? Should I not?"

"Should ___ or Should I Go"

"Should I Stay or Should I Go" singer

"Should I ___ or Should I Go" (1982 song by The Clash)

Letter abbr. that tells the reader there's something else in the envelope