Alternative form of do as I say and not as I do

Alternative form of I wish I may be shot

(colloquial, archaic) A form of mild swearing used to emphasis the truth of an assertion; accompanied by if and the opposite of the assertion.

(rhetorical question, colloquial, childish) Assertion that an insult made by the party to whom the phrase is directed is actually true of that party, and not of the person using the phrase. Usually considered to be a playground taunt.

Indicates that a person's underwear is showing.

(colloquial, rhetorical question) Alternative form of am I right, implying the speaker can't possibly be wrong.

Alternative form of I know you are but what am I

plural of type I error

(statistics) Rejecting the null hypothesis when the null hypothesis is true.

I was wrong.