Disassociation Puns

Guide: (broken english) "There is a lot of grass in this area because...[good reason]."

Dad: (to me, but loud enough for everyone to hear) "You know what the locals call that...?"

Me: "No, what?"

Dad: "Muchas gracias!" (followed by the biggest grin I've ever seen)

Guide: (confused) "De nada..."

My family quickly and casually disassociates before seeing other families face palm for us.

I was the only one who laughed...