Dan let out a high-pitched squeal of delight and broke his clapping to eagerly throw his hands up in the air. He accentuated the motion with another loud, pleased cry of, "BIIIIIIG BOOOM-BOOOOOOOOOOOOM!"
After this, the boy broke down into a delighted series of giggles. After a solid ten seconds of infantile laughter, however, he began to realize a problem.
"... Hm... Uh... Buh..."
Dan looked back at the seat of his diaper once again. He felt tempted to start laughing once again, and gave another loud, "Snk!", but he managed to retain the more pressing thought in his head after a moment.
"Nobody c'n see the boom-boom!"
That's right! Nobody besides him was home right now! And he was all the way upstairs by himself!
"Ooh..."
With a childish noise of wonder, Dan got an idea. If no one was around to see it, clearly he had to go show it to them! That made sense!
That was all the thinking necessary for Dan to begin a quick, enthusiastic waddle out of the bathroom and toward the stairs, then down them and toward the front door. As he reached the bottom, he resumed crying, "I made boom-boom! I made boom-boom!"