I think….

I think, therefore I am. ~ Decartes

I think, therefore I am, I think.

I doubt, therefore I might be.

I don’t think so, therefore I’m probably not.

I forget, therefore I was.

I drink therefore I am. ~ W. C. Fields

I think, therefore I am single.

Cogito cogito ergo cogito sum. (I think that I think, therefore I think that I am.)

I rant, therefore I am. ~ Dennis Miller

Cogito Ergo Spud–I think, therefore I yam.

They think, therefore I am. ~ God

I am therefore I think.