From looking at this photo and comparing to more recents pics, you can tell Bono had a little dental work done. never noticed that he had that little gap before.
One of my favorite little wicked smiles from Bono is in the R&H movie, when he asks the girl if he can take a pic of Larry on the motorcycle and puts his arm around her, and gets her to giggle. He looks to the side, winks (i think) with that little "i know i'm charming" smile, because of course, he got his way. Anyone has a still of that moment?