Perhaps they made no sense?
Perhaps they were trying to be arty?
Perhaps they are intellectually very deep?
Perhaps they were just stupid nonsense?
Let's talk about them here....
Hmm, I think I have seen Un Chien Andalou once, since it was in the 1001 Movies You Must See Before You Die book. Another similarly weird/artistic short film in that book is Meshes of the Afternoon (1943). It somehow made it to BBC's top 40 American movies ever in 2015. o_OUn Chien Andelou: Eight minutes of bizarre surreal goodness
Yes! I grew up with Twin Peaks and Fire Walk With Me came out while I was in high school. My friends and I all had expectations of weirdness but it blew them out of the waterI'd expected both Fire Walk With Me and, much later, Tideland to be weird in their ways, but they were so much weirder than I was ready for... so I had to expand my weirdness receptors to cope - much better than a popcorn experience any day.
Strangest of all was the 3 day event of seeing Bertolucci's 1900 in two halves with Bugsy Malone on the day in-between. A film sandwich of real and playtime violence best not attempted, really.