As an 8y/o my dad used to let me stay up on sat nights to watch Time Tunnel followed by Star Trek back in the late 60s. - Then my mum took me to the Drive in to see 2001:A Space Odyssey - and I was hooked.
Heinlein & Asimov novels followed - then Larry Niven who remains a favourite. Took 4 attempts to read Dune - but finally got it and read all the sequels, prequels, and spin offs - saw the movie and mini-series and sort of enjoyed both.
But to add to the movie thread, The Andromeda Strain was great, as was Silent Running.
If you though Dark Star was wierd, did you ever try watching Zardoz with Sean Connery?
My top 3 movies of all time?
2001
Aliens
BladeRunner