If a doctor writes 'Pumpkin Positive' on your notes, they mean that if they shone a penlight into your mouth, they would encounter a brain so small that your whole head would light up.

I hate to ask, but do you know this from, ahem,
personal experience??

No. The voices told me it was true.

Is that another way of saying 'Couldn't pour beer out of a boot if the instructions were written on the sole?'
Heh - or...
... a few fries short of a Happy Meal?
... the lights are on upstairs, but nobody's home?
