Google is an acceptable reference material during December and Emma's iPhone is surgically attached to her (or at least it seems to be) so I figured this clue would be a good one for them. They would have no idea who Blondie was and would have to do some online research.
To make sure the clue was accurate, I actually looked up the schedule for Galveston.
EMMA: "Blondie sang that this was high, but she was holding on. At precisely 5:10 pm tonight it will be high in Galvestun, Galvest-on" . . . not sure how to say that so it actually rhymes.
Sheesh! Tough crowd!
Now would be the fun part, where the phone would come out so they could figure out the cl-
KARL: It's either the sun or the tide.
Oh! The kid is smart!
EMMA: OK . . . it might be the tide . . .
KARL: But that makes no sense - are we supposed to get to Galveston by 5:10 pm?
EMMA: I know! This makes absolutely no sense!
KARL: Wait a minute! It's Tide. You know . . . laundry detergent.
They rushed to the laundry room.
EMMA: Whoa. Dude. That's impressive - I would have NEVER figured that out!
ME: Can you find the money again? I wasn't ready with the camera.
KARL: Sure, let me look "natural".
Oh yes, that was really "natural". He's a funny kid.
On their way to put the money in the envelopes -
EMMA: You know this money is for charity, right Karl?
KARL: Wait - ALL of it? I thought I only had to donate half!
Ah, the Christmas spirit!