"The Adventures Buckaroo Banzai Across the 8th Dimension" 1984
Great script, great cast, young Johnathan Lithgow and Christopher Llyod, Peter Weller in one of his best rolls, and bonus Jeff Goldblum as they new guy.
Whole thing is still a perfect package, looking like a B movie you'd totally skip.
I'm lucky it's survived so long. I got it in HS, and in between:
Did a tour in the Army
Went to college
Lived in Germany
Have moved over a half dozen times
So many valued possessions have gone missing in that time, due to roommates and sheer carelessness, it's a minor miracle it's still with me. The only original possession I have that's older is a Bloom County Opus plushy that I got in junior high.