Time travel movies - what's your favorite?

Let's chat, I'm in that mood to watch more time travel and convoluted plots. I'm mostly focusing on movies where the time travel is a central theme. Here's two of my favorites to get the discussion started:

1. Primer

• The most realistic and gritty/mumblecore version of a time travel story that I've seen. Loved this, and on an absolute shoestring budget, it's even more impressive.

2. Tenet

• A bonified blockbuster with a very cool visual application of time travel. Just good fun, and some depth to the implications as well.