When Tillie brushes her teeth, the bathroom sink won't drain. Instead, the sink overflows and water goes all over the floor. Tillie's smart, so she quickly turns off the faucet and calls for Gramma.

After they mop up the water, Gramma calls P-Trap the plumber, who comes over as fast as he can. Tillie's fascinated as she watches P-Trap work. Noticing this, the friendly plumber lets her help unclog the sink, talking her through the process and letting her use his tools. He even tells her how he got his unusual name.

When the job's finished, Tillie thinks she'd like to be a...