It took me 10 attempts to understand what he said in the last line of Brokeback Mountain, in fact, I only finally understood when I resorted to subtitles and then I think I'd kind of lost the moment because I still don't get the "Jack, I swear" bit. In fact, the whole film was better the second time round with subtitles so I didn't have to struggle to hear what Ennis was saying. As much as I love Heath Ledger and loved BBM there was a whole lot of mumbling going on during that film. Have a look at Ledger on Ellen's chat show - her BBM skit (absolutely hilarious) and his explanation of the mumbling. Heath Ledger on Ellen - YouTube