You: What do you call a door knob without the lock?
Me: I don't know.
You: Are you sure?
Me: I don't know.
You: Okay.
Door Knob
Explanation
Explain Bear
Hey, numbskull! The joke is that the person is being asked if they "are you sure?" because it sounds like "azure". Azure is a deep blue color, like some door knobs maybe.
The_G_y_C0us!n
deez nuts
Anonymous
Ligma ballz