summertime
Explanation
The Joke
The comic shows Winnie the Pooh greeting Christopher Robin at his door, exclaiming: "Christopher Robin! Welcome to-- Christ Jesus, you were wearing shorts out there? You'll be exsanguinated! Let me get my tweezers!" Below this scene is a caption that reads: "Whenever you read a novel about a child running through the woods in summertime, remember they were probably covered with ticks by the time they got home."
The joke takes the idyllic, nostalgic image of childhood adventures in the Hundred Acre Wood and injects harsh biological reality. In the classic Winnie-the-Pooh stories, Christopher Robin romps freely through forests and meadows. But in actual rural England (or anywhere with wooded areas), a child running through the woods in shorts during summer would inevitably pick up ticks, which are blood-sucking parasites. Pooh's horrified reaction and mention of "exsanguination" (death by blood loss) is a comically extreme version of this concern.
The Humor
The comic works by puncturing literary nostalgia with practical reality. Countless beloved children's books feature kids frolicking through nature in minimal clothing with no consequences, but anyone who has actually spent time in the woods knows that ticks, mosquitoes, poison ivy, and other hazards make this a miserable proposition. Pooh Bear -- normally the most gentle and whimsical of characters -- being the one to deliver this reality check makes it funnier, as does his use of the dramatic medical term "exsanguinated." The image of Winnie the Pooh armed with tweezers for tick removal is a delightfully absurd collision of cozy children's fiction and unglamorous outdoor hygiene.
References
The comic references A.A. Milne's Winnie-the-Pooh stories (1926-1928), in which Christopher Robin and his stuffed animal friends have gentle adventures in the Hundred Acre Wood, inspired by Ashdown Forest in East Sussex, England. Ticks are indeed a significant concern in wooded and grassy areas during summer months, and tweezers are the recommended tool for removing them.