| 2026-03-25 | Head block? |
| 2026-02-01 | Never mind? |
| 2022-09-09 | Ironic-sounding plot device in "Total Recall" |
| 2020-09-11 | Plot device that prompts a protagonist to piece things together |
| 2014-02-25 | Overused plot device in soaps |
| 2012-08-17 | "The Bourne Identity" plot device |
| 2011-01-19 | Dory's affliction in "Finding Nemo" |
| 2009-09-03 | Overused soap opera plot device |
| 2009-05-14 | Result of butting heads? |
| 2006-09-01 | Calling up trouble? |
| 2004-03-14 | Occasional soap opera plot feature |
| 2003-01-05 | Common soap opera affliction |
| 2002-01-02 | Knock-on-the-noggin consequence |
| 1999-11-21 | Condition sometimes treated by hypnosis |
| 1997-08-22 | Courtroom alibi, perhaps |
| 1996-09-29 | Reason for an identity crisis |
| 1996-05-09 | Result of a head injury, maybe |
| 1995-03-06 | More than forgetfulness |
| 1994-06-25 | Serious lapse |