My Friends Americans, Have You Ever Had Trouble with Immigration in Another Country?

CBP is notoriously known for being unfriendly. They often catch people off guard with absurd questions. For instance, a friend of mine once said he came to the U.S. to visit a friend, and the officer asked, "Why are you visiting your friend?" On the other hand, have any of you had difficult experiences with immigration officers outside the U.S.?