Another early Linus/Snoopy interaction. That's a rather overstated frown in the last panel there.
A simple gag about a kid not understanding an idiom. Yeah yeah, let's get to the real reason we're here:
THIS. One of the most important strips in Peanuts' entire run. The first strip in which Snoopy fantasizes about being something else. In these four panels we see the origin of the World War I Flying Ace, Joe Cool, and a hundred World Famous things. They are cute strips of course, but there are strange depths buried there.
This strip is a bit problematic mechanically though. Schulz uses a thought balloon for Snoopy's thoughts in the first panel, but in the second the balloon does double-duty as a thought and speech balloon, which makes it seem like Snoopy is speaking in English.
Charlie Brown's wide, amused smile is, in its way, as funny as Snoopy's snarl.
Lucy is willfully wrong about something else. Some notes here:
1. The subplot about Charlie Brown's paddleball is a nice touch.
2. The letters asked about and responded with are written with serifs and with little single-quotes around them.
3. Charlie Brown's annoyance that Lucy refuses to believe 'F' follows 'E' in the alphabet is interesting. He seems to care that Lucy get her facts straight, and takes it personally when she refuses to see reality. That's admirable in a way, but will probably cause him problems later in life, for there is no shortage of Lucys in the world.
When I was a kid, I would read these strips where Lucy is referred to calmly as a fussbudget, and the sarcasm flew roughly two miles over my head. It didn't help that Lucy would then respond without a trace of irony. The humor of Peanuts could be really dry sometimes.
Violet's smile throughout this strip is vaguely infuriating.