So I was at the front table talking to
Some organized panic ensued as we bundled him up into the emergency pet carrier and went down to the vet. While we were watching him, he seemed to finally clear his throat, which helped him a lot. (Rats aren't usually able to regurgitate, so if they can't swallow something it can be a fatal choking hazard... It's how several rat poisons work.) He was still wheezing and snuffling as we got him into the vet. Best he could say was watch him for a few days to make sure he didn't get any fluid in his lungs while choking.
So everything seems to be okay. We'll keep a close eye on the little guy, though.
Also, rat-related:
Trevor, that stinkin' dirty rat... litteraly
What Meet the Feebles character are you?
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(I'm surprised I didn't get Sebastian, honestly.)