A better way to shorten a t-shirt

Ok if you want to cut a piece of a T-shirt in order to shorten it the best way is not to attack it with a pair of scissors as I did the first one. A preferable method is to get a rotary cutter and a cutting board and a ruler then you have a much better chance of getting a nice straight line. Eat your heart out Sister Veronica aka my needlework teacher.