I'm suggesting an addition to the Witness Protection Program. For those who aren't familiar,
mosca has compiled a list of grammatical, style, and content offenses common to fanfic. I'm specifically suggesting an addendum to the section about characters crying.
If I have to read the phrase "a single tear rolled down her cheek" one more time, I may need to swat the author with a rolled-up newspaper. Repeatedly.
Folks, if your character is so moved by events that he or she responds with tears here's what happens: either they tear up just a little, their eyes get shiny, maybe a little moisture in the corners that seeps onto the side of the nose; or that first tear is followed by a few more. Only in that 1970's environmental PSA has there been a character with only one melancholy tear rolling stoically down his face. And FYI, that was actually glycerin.
That whole notion of "one tear escaping to illustrate the poignant depths of their feeling" is tired. Find some other way to describe their conflicted emotional state, maybe a tick or nervous gesture you've seen the character perform. Laura Innes has this great bit of business she inserts in Kerry Weaver's emotionally-charged scenes; look for something like that. Laughter is another emotional release valve; some characters might laugh innapropriately /bitterly/reflexively instead of crying. (Abby Lockharrt, anyone?) Think about that before you write the scene.
And get a beta reader.
< / end rant>