A woman in a blue plaid shirt and sunglasses scratches her face as she walks down the street .
It is impossible that a woman in a plaid shirt scratches a bug off her face .
It is impossible that a woman in a plaid shirt scratches a bug off her face .
There is a very good chance that a woman in a plaid shirt scratches a bug off her face .
A woman in a plaid shirt scratches a bug off her face .