I see that Elf is making himself at home and has decided to take up getting acquainted with the other toys.
Although from his vantage point I'm not sure he was shaking hands with the monkey.
Kind of looks to me like a plan of attack. You know how you get off the bus and unknowingly get bombarded with snowballs before you can even make one. Before you even know what hit you.
What is that on your lap?
Oh, dear it looks like you ran out of snowballs and I came upstairs at the right time!
Not nice Elf! You are a guest in our house and I expect you to behave just like everyone else. Which means if you want to throw snowballs at anyone you need to give them a heads up!