Greg Heffley: Stop. You look like one of the seven dwarves. Always wear one strap. One strap is cool.
Rowley Jefferson: Then why do they put two straps instead of one?
Greg Heffley: [walking] Because the people who make backpacks aren't cool.
Greg Heffley: [stops walking] You know what has one strap? Machine guns. You know what else? Electric guitars.
Greg Heffley: [continues walking] You know what else?
Rowley Jefferson: Purses?