Here are some more examples of how changing the punctuation can completely change the meaning…
a. When I sing well, ladies feel sick.
(My good singing makes ladies feel sick)
b. When I sing, well ladies feel sick.
(My singing makes healthy ladies feel unwell)
a. Watch out – man eating apes!
(the man eats apes)
b. Watch out – man-eating apes!
(the apes eat men)
a. We order merchandise and sell the products.
(We do 2 things)
b. We order, merchandise and sell the products.
(We do 3 things)
a. You will be required to work twenty four-hour shifts.
(You work for a short time)
b. You will be required to work twenty-four-hour shifts.
(You work for a very long time)