That eggnog jingle and the gel pens jingle were almost too terrible to have actually been written out ahead of time, but maybe he just came up with a few specific rhythms in his head before filming started, knowing that he’d want to use them.
And if he didn’t improvise all that, he gets a similar supply of kudos for sending me into a spiral of confusion.
It came across somewhat as if John Cena was making up all of those jingles on the spot, as opposed to prepping things ahead of time.
If he did improvise all that, he gets some major kudos from me.