Mexican's Favorite Sport

Listen up, buttercup. The joke is that "cross-country" sounds like "crossing the country," which is what some Mexicans do when they, uh, decide to visit the US without an invitation, if you catch my drift. It plays on the stereotype that all Mexicans are illegal immigrants. It's funny because it's... topical? You wouldn't get it. You're probably the type to ask for the manager when they're out to lunch.