What ends in a W, has no beginning, and is always in the present? Now.

“Instead of a Lemonade Stand, I should open up a “You know what I can’t stand?” …”

“I don’t know when I’m going to stop when I start—or start when I stop. That’s w…”

“My name is Mr. Potatohead, and I’m looking for my wife. But I fear I’m too late…”

“She asked me if I wanted to have sex, and I replied, “With you, or in general?”