Okay, '80s movie.
Kid gets abducted by an alien spacecraft. Spacecraft looks something like a cross between a football and the headgear worn in the movie Predator. Eventually gets returned, but due to flying around at near light speed about 15 years have passed back on earth.
Memorable Scenes:
All the alien “pets” on the ship dancing to the Beach Boys.
Ship stops at a remote intersection in California so the kid can ask for directions back to his hometown.
Kid falls into a coma and some sort of EEG printout makes the outline of the spacecraft.
Any guesses?