Suddenly, Richard blinked.
How on earth does that make sense!?! Apparently, Richard is an alien that comes from a world where blinking is totally unexpected. Either that, or everyone blinks in slow motion... except Richard, who is the MOST EFFICIENT BLINKER EVER.
By the way, I have to interrupt myself to laugh at the fact that if you Google my editor's name, you get the above picture of Richard Simmons. And it's all my fault. Hee.
Anyway, sentences like the sudden blinking above really get me going. So I've been hyperaware of suddenlies in my writing. What grammatical mistakes really drive you bonkers?