Phone Booth (2002) ending / spoiler
Stu manages to survive his ordeal while he identifies the caller as the man who tried to deliver him a pizza in the beginning of the film. It turns out the caller is still alive and he pays Stu a visit while he is in the ambulance. He lets him live but promises he'll be back if Stu loses his new found honesty. And then a phone rings.
Submitted by Nick