21.   But when they looked behind them, they discovered this was no hallucination.

22.   Defensive backs, who often had to look behind to see Glenn, were impressed by the rookie.

23.   Desperate, frantic, Bickers finally phoned a psychic friend, who told her to look again behind a sofa cushion.

24.   Everything you find, you have to look behind something.

25.   He also is reluctant to look behind.

26.   He was all over town trying to wake people up, but in the end, when he looked behind him, no one was there.

27.   I asked, looking behind me.

28.   I passed him on Heartbreak Hill and I was afraid to look behind me again for fear he was coming.

29.   I live looking behind my shoulder.

30.   I looked behind me to see who was in for it.