I’ve heard about five of them - one through four and number nine. But I’ve only seen 2001, Buckaroo Banzai, and Inception.
I’ve seen four, three at the theater when they came out - 1, 3, 9.
At least with #2, they didn’t use the Clooney remake, but stayed with the original Soviet version.
#3: If case you’re wondering, “What’s that watermelon doing there?”: The producer, who eventually took his own life, btw, was under contract to do the movie, and his disdain for the production was felt by the cast and crew, so, they decided to have a little fun.
I’ve heard of two of the others.