They'll tell you! (Source: am an engineer)
She starts her sentance with "A man once told me"
You can hear someone scooting aboot in it
zzzzzzzzz, wait, I fell asleep at the punchline.
Don't worry they'll tell you
Because it's two gross! (A gross is a measurement unit for "144". So 2 * 144 = 288. Or "two gross".)