Daddy's going to get you!

Nathaniel loves to play "Daddy's going to get you!" Basically, all Christopher has to do is walk across the room and Nathaniel starts squirming and giggling in my lap. To let Christopher know Nathaniel wants daddy to "get him" and to escalate Nathaniel's excitement, I'll start to say "oh, no, daddy's going to get you!" He screeches, squirms, and buries his head into my lap. Then, Christopher runs over and starts tickling Nathaniel. Here is a video clip of the tickling part.