(philosophy) I am able to think, therefore I exist. A philosophical proof of existence based on the fact that someone capable of any form of thought necessarily exists.

I can't help the way I am

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

(colloquial) Used when a speaker attempts to categorize an observable fact or event, although the category is subjective or lacks clearly defined parameters.

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

Alternative form of I wish I may be shot

(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.

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

Indicates that a person's underwear is showing.

Alternative form of I know you are but what am I