It's just too hard.
Because he was in de-nile.
let's jack it.
Mourning wood!
With their erections.
PEEr pressure!
Because the pee is silent.
Ten. (Shame this one doesn't work too well for reddit - the funniest part of this joke is the third punchline enjoying people struggle to understand what the hell you're talking about.)
For those of us that struggle with our family perhaps this will help break the ice.