A boy walks down the sidewalk with a trash bag while two other boys follow him .
It is impossible that a boy walks down a sidewalk while two boys follow to beat him up .
It is impossible that a boy walks down a sidewalk while two boys follow to beat him up .
There is a better than even chance that a boy walks down a sidewalk while two boys follow to beat him up .
A boy walks down a sidewalk while two boys follow to beat him up .