After reading these posts, I also wanted to shout, "me too! me too!" a couple of times - I am sooooo glad others had similar experiences. I'm also glad that I was alone when watching it for the first time - I could really let it all out. I was fine throughout the movie, but when Ennis found the shirts...it felt like somebody was sitting on my chest while someone else was ripping my heart out. Then came the last scene and Ennis' final words. Cut to me rolling across the carpet, sobbing uncontrollably... I know I'm putting a slightly humorous twist on the event, but in all seriousness, I don't think I can succesfully describe what I really experienced. All I know is that is was/is big. And it is not letting go. I always sort-off smirked when I heard about people having cried themselves to sleep, but the morning after, I realized that I did exactly that.
Some of you mentioned "flashes" from the movie in your daily life. I get that too - and when they come so unexpectedly, it cathes me off-guard. The day after seeing the movie for the first time, I was teaching and explaining like I always do. Turning to write on the blackboard, I had this sudden flashback. Now, a couple of days after, I still get them regularly. Brokeback sure got me good too.