Life In Every Breath

So, I had put David in his swing so I could spend a little time surfing the internet, and he wasn't liking the idea very much and was fussing.
Liam went over and I've let them be to see what happens. Here's the outcome so far:
First, Liam turned OFF the swing. Usually a bad idea, but didn't seem to make a difference this time.
Then, Liam started playing with the fish mobile, two of the fish talking to each other about how they are not boy friend and girl friend. Odd conversation to be imagined by a 3 1/2 year old, but okay.
Then Liam started gibbering at David and touching his face. Mom intervenes---"Don't poke him like that." ... "Don't pinch his nose" ... "Be gentle".
Then Liam stepped back and put on his 'air guitar' and started jamming out and singing. This worked until Liam started scream-singing, at which point David started screaming too. Mom intervenes again---"You're scaring him, not so loud honey!"

Well, Liam has apparently gotten bored with his self-given job as David's entertainment. Mommy's turn.