Four bad links

False Twin Links

Two links with similar wording, so that it seems as if they would lead to the same thing — but they don't.

(No click: "I've already been there.")

Non-Identical Twin Links

Two links with very different wording, so that it seems as if they would lead to two different things — but instead, they go to exactly the same thing.

(Click: "Hey! I've already been here!")

Mystery Link

Obscure words (often just one word) or a cryptic image, so that the user doesn't know what to expect.

(No click: "Huh? I'm not going there.")

Trick Link

Text or an image that raises a false expectation or fails to indicate that something out of the ordinary will result.

(Click: "No! I didn't WANT to download a file!")

See also Ten link rules.