| 2026-07-15 | Daffy Duck characteristic |
| 2025-07-30 | Sigmatism |
| 2025-05-01 | Daffy Duck speaking feature |
| 2025-03-05 | Speech therapist's concern |
| 2025-01-03 | Aristotle purportedly spoke with one |
| 2024-07-07 | Speech therapy subject |
| 2024-03-03 | Sigmatism, by another name |
| 2023-11-14 | Challenge for a speech coach |
| 2023-11-13 | Talk like Sylvester the Cat |
| 2023-07-14 | Challenge for a speech pathologist |
| 2023-01-22 | Feature of Sylvester's speech |
| 2022-11-19 | Sigmatism |
| 2022-11-15 | Speech therapist's concern |
| 2022-10-24 | Speech therapist's concern |
| 2021-03-05 | Sigmatism, by another name |
| 2020-11-22 | Misarticulate, in a way |
| 2020-07-26 | What Winthrop speaks with in "The Music Man" |
| 2019-08-31 | Tip-of-the-tongue phenomenon |
| 2019-05-11 | Not get some Z's, say? |
| 2019-01-12 | Oratory obstacle |
| 2018-07-22 | Sylvester's speech feature |
| 2018-06-12 | Imitate Daffy Duck |
| 2017-12-23 | Discuss thickness with a doctor? |
| 2015-11-19 | Sigmatism |
| 2015-08-04 | Thpeak like thith |
| 2015-01-11 | Have trouble with sass? |
| 2014-06-12 | Not be able to say "say," say |
| 2014-02-16 | Challenge for a speech coach |
| 2013-04-16 | Someone who has it can't say it |
| 2012-12-17 | Favor a "th" sound |
| 2012-02-13 | Speak like Sylvester |
| 2011-07-01 | Winthrop's affliction in "The Music Man" |
| 2011-06-16 | *Not get some Z's? |
| 2010-10-04 | Daffy Duck has one |
| 2009-06-17 | Daffy Duck trademark |
| 2009-04-12 | Orator's challenge |
| 2008-10-02 | Talk like Daffy |
| 2007-08-01 | Slip of the tongue, maybe |
| 2007-04-10 | Say "thay," e.g. |
| 2006-01-19 | Beth for Bess, e.g. |
| 2005-10-23 | Pronunciation difficulty |
| 2005-10-02 | Sibilant talk |
| 2005-06-25 | Daffy characteristic |
| 2003-05-10 | One way to make a sinner thinner |
| 2003-04-05 | Subject for a speech therapist |
| 2003-03-12 | Talk like Daffy |
| 2002-11-28 | Topic in speech therapy |
| 2001-11-27 | Saying "th" for "s" |
| 2001-04-24 | Speech problem |
| 2000-11-19 | Have trouble with assessors? |
| 2000-09-17 | Speak like Sylvester |
| 2000-07-09 | Imperfect speech |
| 2000-04-29 | Result of lingual protrusion |
| 1999-05-13 | Challenge for a speech coach |
| 1999-01-15 | Job for a speech coach |
| 1998-01-19 | Daffy Duck's impediment |
| 1997-09-29 | Have trouble with esses |
| 1997-09-08 | Speech problem |
| 1996-12-01 | Say "z" imperfectly |
| 1994-12-08 | Have trouble with sisters? |
| 1994-09-06 | Speech impediment |
| 1994-03-07 | Sigmatism |
| 1994-02-28 | Tot's talk, perhaps |
| 1994-02-16 | Speech problem |
| 1994-01-23 | Speaketh? |
| 1994-01-18 | Daffy Duck talk |
| 1993-12-31 | Kiddie talk? |