The second panel here is a particular favorite of mine. Lucy is weighing her options.
This may be the first direct instance of direct violence in Peanuts. There have been chases before, and chases of being hit by projectiles (like one where Lucy hits Charlie Brown with a snowball at very cose range) but I don't think anyone has actually hit another kid before now, with hand or weapon. I'm sure one of you will correct me if I've remembered wrong. (In fact, I'm looking forward to it.)
Now that another character has directly remarked on Charlie Brown's lack of playing skill, it has become a bit more solidified as an attribute of the character himself.
45 minutes ago