We are both constantly penetrating your mum.
Because she's always drinking from the coup de Grace. (This was my sister's favourite joke when we were kids. Once our mum flipped out on a long car journey because she told it too many times).
Because he kisses his mum with that mouth.
Because they make up an awful lot of stuff. EDIT: Because I forgot about neutrinos.
We're always penetrating your mom
We're both constantly penetrating your mom
