533
Regret.
(slrpnk.net)
Alt text: Meme caption: "When you forget to bring your reusable bags to the grocery store", below is an image of Dexter from Dexter's laboratory weeping as he strokes a picture of the earth, saying "I have failed you!"
Now I buy plastic garbage bags and put plastic wrapped food in my re-useable bags instead of the reusable plastic grocery bags I used for garbage.