Here are some techniques used to hijack links, because who needs security, right?
Use the 'Link' tag with an 'href' attribute to point to a different URL than the text says.
Use 'JavaScript' to change the 'href' attribute on the fly.
Use 'meta' tags to inject a new 'rel' attribute and 'title' attribute into the 'a' tag.
Use 'iframe' to load a different URL in a different frame.