This video is great. It's from Christmas Eve when the kids were outside putting out their reindeer food. Since it's kind of hard to understand toddlers when they're not yours, key comments of interest are:
At around 5 secs Rylie: "He went away. He went so fast!"
At around 10 secs Mikaiya: "There's another Santa!"
Right after that (Danny, Nate or Jeff): "Santa's got jets!"
Yep, you guessed it...the kids thought the planes flying overhead were in fact Santa. Gotta love it!