For me it's got to be the Back to the Future series. It's a science fiction film with a comedy twist to it. The famous actor Michael J. Fox accidently travels back in time as he had to try to solve family problems back then to not change the history of his family in the future.
My personal favorite would probably be Honey I Shrunk the Kids. I remember watching it as a kid and being mesmerized when they shrunk down and were in the yard. I watched it last weekend with my little brother too.
I love the Men In Black series. Will Smith was perfect for those movies and he made them into a comedy sci fi type saving the world from aliens. The latest Men In Black wasn't that great but still it was all right.
This is one of the most difficult, challenging questions to answer of all time. My favorite movie is available to stream on Netflix and Amazon prime; is the lucifer series. It's easy to get into it too.