Overheard at Bedtime

Those of you with 2 boys near the same age will probably know this scenario all too well. I'll just point out that these guys learn a disturbing number of off-colour words at school. A lot more than I did at age 5 or 7. Even though they've been taught the proper words, they usually prefer to use the ones their friends are using.

Overheard at bedtime:
#1: “My penis is bigger than your penis!”
#2: [pauses to mull this over] “So? My balls are bigger than yours.”