If I need to? Darin, you can be... erm, somewhat...

[She struggles with figuring out how to phrase it politely, before deciding to see if she can get away with frank honesty.]

... you can be remarkably oblivious sometimes. [Not recognizing he with a mask comes to mind.] But I'd like to hope that even you can take a hint without going that far!

Besides, I could always try what you did, and dunk you in freezing cold water.