It’s not a joke if it’s not entirely clear. But most jokes play off of ambiguity and sudden juxtaposition, so a joke has to be clearly unclear.

“To become one who believes two become one, you need love in your life.”

“You know what really chokes me up? Being strangled.”

“A sample may taste better than the whole, because it’s meant for a taste test, …”

“She said, “You disgust me. How do you live with yourself?” So I said, “Like I l…”