Title text: I've looked into this, and I can't figure out a way to do it cheaply. And I guess it wouldn't be sanitary.
Randall is playing with the child/grownup setup again. As we all know, our parents are defining our adulthood. Many of times, they do that by saying "That's only for grownups" while taking controlled substances like alcohol, or smoking. At other times, you (as a child) get to hear "We don't do that anymore, we're grownups now" (for instance, playing at a playground). Megan has taken these thoughts seriously, and now she has defined her adulthood by creating a playpen in her apartment, going against the latter statement. Cueball also finds this definition great, as he comes into the playpen, and adulthood and childhood melt together, judging by the love heart.
The title text reveals that Randall also would like to own his playpen, but he finds it expensive to buy, and also hard to keep clean. Which is a fact. Most public playpens contain over 100 different samples of urine, as many children and toddlers play in them.
The characters of this comic show up again in 219: Blanket Fort.
- [Cueball is talking to Megan who is behind a waste-high screen across a doorway with colorful playpen balls behind her.]
- Cueball: Hey, I was wondering if you had plans for-- holy crap, what happened to your apartment?
- Megan: I filled it with playpen balls!
- Cueball: I... what? Why?
- Megan: Because we're grown-ups now, and it's our turn to decide what that means.
- [Both vanish into the apartment, balls spilling out into the corridor. A love heart drifts out the door, indicating you-know-what.]
Randall, author of the comic, actually built one in his apartment, which he talks about and shows pictures of at here and here. Speaking of cost,  has a calculator for how much it would cost to make your own ball pit.add a comment!