Southwest Airlines Flight, Pittsburgh to Chicago.
Airplane safety instructions are printed on the seatbacks in both English and Spanish:

Middle-Aged Pittsburgh Wife: [pointing to instructions] I wonder which word is “seat”? I mean, it says “seat” here [points to “Fasten Seat Belt While Seated”] and it says “seat” here [points to “Use Seat Bottom Cushion For Flotation”] but none of the Spanish words are the same.
Middle-Aged Pittsburgh Husband: That’s weird; maybe “su” means “seat”.
Middle-Aged Pittsburgh Wife: But then why doesn’t it say “su” over here? [points to “Use el Asiento Para Flotar”]
Middle-Aged Pittsburgh Husband: I bet they say totally different things in English and Spanish, but we’ll never know!

- Overheard by Think Different