Canada and Mexico squabbling over visas.

And of course, the US is caught in the middle (geographically). From Yahoo! Canada:

Mexico on Thursday retaliated against Canada for imposing new visa requirements on Mexicans wishing to visit Canada, saying Canadian officials and diplomats would now need visas to enter Mexico.

Mexican Foreign Secretary Patricia Espinosa announced the move at the State Department in Washington where she held talks with Canadian Foreign Minister Lawrence Cannon and Secretary of State Hillary Rodham Clinton. She said Mexico would not force Canadian tourists - who number 1.3 million a year and are vital to the Mexican economy - to get visas to visit.

She and Cannon both said they were hopeful that a resolution to the diplomatic spat could be reached quickly. Canada on Tuesday began requiring visas from travellers from Mexico and the Czech Republic after Canadian authorities determined that the number of false refugee claims from those two countries was inordinantly high.