What is original i hardly know her joke?

The "I hardly know her!" joke is a classic, simple, and often silly gag that relies on a predictable setup and punchline. It falls into the category of a "setup-punchline" joke.

The structure is generally as follows:

1. The Setup: Someone says a word or phrase that sounds very similar to a common female name (or occasionally a male name).
2. The Prompt: Someone asks "Who's her?"
3. The Punchline: The person responds "I hardly know her!" (or "I hardly know him!").

The humor comes from the unexpected switch of context, the pun, and the sheer absurdity of the response. The joke is popular because it's easily adaptable.