I couldn't find 7.5mo DD's sippy cup tonight so I let her have a sip of water from a normal cup. I'd let her do this once before and she'd really enjoyed it.
She was excited about it, and grabbed the cup, much harder than I expected. A load of water went into her mouth, at the same time she was making noises, and she choked on it.
She coughed for a couple of minutes, then cried for a while after, not nice 
This was a couple of hours ago. She's seemed fine except for some more coughing about an hour ago, which lasted maybe 3 minutes.
Now I'm getting paranoid about dry drowning. What do you think? Am I being nuts or is this a possibility?