Regarding the web site's "How to Tell You're in Canada" page --

We have engine block heaters here in Minnesota, too. Not every car needs them, but everyone knows what they are.

I have heard dentists say "freeze" in the way described on the web site, but they are perhaps more likely to use the word "numb" as a verb: "We'll numb that for you." Asking for Novocaine brands you as a non-dentist.