Stealing from the cookie jar is the world's most performed peccadillo. Stealing from the cookie jar is the world's most performed peccadillo.

Peccadillo: (noun) a small sin or a trifling fault 

In a sentence: 

GM: Get your things together and leave immediately before I call the police.

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Cleaner: But it was only a peccadillo, please have mercy, I have a family to feed.

GM: Peccadillo or no peccadillo, you have shattered my trust in you and when that happens I turn my back.

Cleaner: I only took one pillow chocolate.

GM: So what? If I get caught stealing one Rolls Royce, does the car dealer let me off because I didn't take every one in his showroom? Be gone!