And that is why you fail
A phrase used to indicate when a person is at fault or had made some sort of mistake. Can be used in a similar manner as "that's what she said" at the end of the persons' sentence.
Leaving the mall after a long day of shopping for a friends birthday present
Jake: Dude, so what did you buy?
Adam: I bought some shirts, jeans, and a fresh pair of kicks.
Jake: So which one of those is the gift?
Adam: ....gift?
Jake: And that is why you fail...
Jake: Dude, so what did you buy?
Adam: I bought some shirts, jeans, and a fresh pair of kicks.
Jake: So which one of those is the gift?
Adam: ....gift?
Jake: And that is why you fail...