Exhiliarating linguistic moments

Last week when I was visiting family and trying to get cable for my new apartment, I called the company. I think the call center is somewhere in Georgia because of the accent of the people who answer, but who knows. Anyways, I was thrilled when, towards the end of the conversation, the helper used "may can" in a sentence, and when I was done on the phone I went jumping around the house shouting "I just heard the double modal construction! I just heard the double modal construction!"

Of course, then I had to explain to my family what the hell I was talking about.

Any similar "Aha! I've studied/read about this!" moments from the rest of you?


[EDIT]
It doesn't have to be linguistic-y or English.

Another example from me: hearing « ojala que...» on a Spanish soap opera.
[/EDIT]