Girl #1: Is Cu­ba part of North Amer­i­ca?
Girl #2: Do they speak Span­ish in Cu­ba?
Girl #1: Yes.
Girl #2: Then no. Cu­ba is not part of North Amer­i­ca.
Guy: What about Mex­i­co? They speak Span­ish in Mex­i­co.
Girl #2: Mex­i­cans are il­le­gal.

http://www.overheardatmcgill.com/archives/2007/04/19/same-rationale-used-to-keep-quebec-out-of-north-america/