I finally got around to watching Lance Armstrong's interview with Oprah Winfrey.  He tears up a few times when talking about his son.  I find his body language interesting -- such obvious cues that he's fighting off tears, like looking way up at the ceiling whenever it first hits him, then immediately stopping speaking, then looking down, sighing, etc.  And while he's talking, he's either consciously or subconsciously hiding his mouth area (like circling his fingers around it, for example).  I don't really remember him doing that mouth thing during the rest of the interview.  These are things a lot of people probably do when they're trying to fight off tears.  

It's worth watching the whole clip to get the context (but for the quick version, see 1:11, 1:52, and 3:44).

http://popwatch.ew.com/2013/01/19/lance-armstrong-oprah-doping-telling-son/