"It's anything but."
— Tagline of Regular Show
A form of I Thought It Meant, this is when the title of a work is likely to confuse you in a similar manner, particularly if it seems like the name of a trope instead (because some do share names).
See also I Thought It Meant (for misinterpreted trope names), I Read That As (for misread page names) and Similarly Named Works.
Titles to clear up, then: