I was thinking, with the whole Moffat saying we missed something. Sherlock was crying. We all saw the tear fall. That is something out of character, for me at least, then he says "It's what people do, don't they? Leave a note?" And BAM, to me that was Sherlock again. His voice was normal. Crying isn't very Sherlock to me. Maybe that's it? Then he threw the phone and had the look of determination on his face. Plus the shirt was purple, but when he jumped it was white.
Yeah, I don’t know, I’m tending to kind of personally exclude anything that happened during the rooftop scene because he’s lying through his teeth anyway, not to mention at points possibly thinking he was going to die and then having to convince his friend he has was going to die, so it’s all going to be rather effected (but on the contrary, I rather beleive the tears were very real~). Plus, if we get involved in theories on the roof scene you have to start looking at factors such as just how much did Sherlock know or predict and as a result how much had he planned. Was he ever actually afraid he was going to die or was it all a front? It all becomes very relative (which is probably Moffat’s perfect territory, painfully enough).
I’m thinking it’s going to be something that happens before that, conceivably something that happens before the entire roof-top scene which, for me, excludes the theories involving Sherlock tossing his phone, the tears and the call itself as the the ‘clue’.
’Plus the shirt was purple, but when he jumped it was white’ AKJS;ALKS THIS WAS NOT A THING I WAS ABE TO SEE THROUGH MY TEARS! In a conversation with sherlockscheekbones, we decided the white shirt was most probably an undershirt.