The Manhattan Project (1986)

The Manhattan Project (1986)

A teen and his girlfriend make an atomic bomb with plutonium stolen from a scientist dating his mother.  (IMDB) V&D

Paul Stephens: I never thought I'd say this to anybody, but I got to go get the atomic bomb out of the car. 

Jenny Anderman: If we get killed we won't have any future.

Paul Stephens: Of course we will. You always have a future. 

At the very end when they stop the countdown, the timer reads 7:16:45. July 16, 1945 was the date of the Trinity test where the first Atomic bomb was detonated in New Mexico.