Mom and little sister are in the exam room as these 2 boys wait for their pediatrician to come for their checkup, which includes a genital exam. Their mom asks "Are you boys ready to get your balls checked?" The 12-year-old immediately says no, but the 9-year-old smiles and nods his head while saying, "Yeah. Oh, yeah."
The funniest moment is when the younger one says his older brother's balls are little.
Medical exam is one of the main topics at this site.
However, if a story is made of this, I'd prefer the two boys be changed from 9 and 12 to ages eleven and fourteen. Having one barely
pre-pubescent with one just past it would be a better contrast in physical development.