| 2026-04-19 | It's verboten |
| 2026-02-22 | It's verboten |
| 2026-02-15 | Discouraged action |
| 2025-11-15 | Something you should avoid |
| 2025-08-18 | Taboo |
| 2025-02-18 | Don't-do |
| 2024-12-29 | Proscribed action |
| 2024-09-14 | Bad idea |
| 2024-08-22 | Baseball pitcher's feat, informally |
| 2024-08-05 | Something forbidden |
| 2024-04-26 | Something best avoided |
| 2024-01-19 | Leaving a participle dangling in English class, say |
| 2023-10-30 | Using ketchup on a steak at a fancy steakhouse, e.g. |
| 2023-07-09 | Don't |
| 2022-09-13 | Running by the pool, e.g. |
| 2022-06-03 | Giving chocolate to the dog, e.g. |
| 2022-01-26 | Taboo |
| 2021-11-26 | You shouldn't do this |
| 2021-10-11 | Forbidden action |
| 2021-05-16 | Ill-advised move |
| 2020-12-30 | Taboo |
| 2020-07-09 | Bad thing to do |
| 2020-06-07 | Faux pas |
| 2020-04-28 | Eating pizza with a fork and knife, to New Yorkers |
| 2020-03-30 | It's against the rules |
| 2020-01-31 | Roller-skating in the house, say |
| 2019-09-05 | It's verboten |
| 2019-03-28 | Talking in a movie theater, e.g. |
| 2018-07-13 | Eating with one's elbows on the table, e.g. |
| 2018-04-15 | Pitcher's feat, slangily |
| 2018-01-11 | It's taboo |
| 2017-11-21 | Off-limits activity |
| 2017-05-09 | "Don't touch that, honey!" |
| 2017-02-05 | Texting while driving, e.g. |
| 2016-09-23 | Wearing red to a Chinese funeral, e.g. |
| 2016-08-11 | Texting in a theater, e.g. |
| 2016-07-25 | Taboo thing |
| 2016-06-22 | Taboo |
| 2016-04-07 | Texting while driving, e.g. |
| 2016-04-06 | Taboo |
| 2016-01-28 | "Tsk, tsk" elicitor |
| 2015-12-31 | Proscription |
| 2015-07-28 | Playing with matches, e.g. |
| 2015-07-19 | Don't do it |
| 2015-05-24 | "That's a ___" |
| 2015-04-05 | Talking during a movie, e.g. |
| 2013-08-18 | Texting while driving, e.g. |
| 2013-06-11 | Something to avoid |
| 2013-05-13 | Something you might get your hand slapped for doing |
| 2012-10-29 | It's taboo |
| 2012-10-02 | "What were you thinking?!" |
| 2011-09-12 | It's prohibited |
| 2011-04-19 | Taboo |
| 2010-11-26 | It's out of bounds |
| 2010-06-09 | Burping in public, e.g. |
| 2010-03-19 | It just isn't done |
| 2009-11-30 | Taboo |
| 2008-12-15 | Taboo |
| 2008-06-01 | Inadvisable action |
| 2008-05-04 | Off-limits item |
| 2008-02-29 | Putting regular gas in a diesel engine, e.g. |
| 2008-01-10 | Don't |
| 2006-12-04 | Taboo |
| 2006-08-14 | Taboo |
| 2006-03-31 | Moral philosophy topic |
| 2006-03-08 | Taboo |
| 2005-11-20 | A doofus might do it |
| 2004-09-27 | Talking on a cell phone during a movie, e.g. |
| 2003-07-26 | Don't |
| 2003-07-13 | Roving eyes on an exam, e.g. |
| 2003-06-27 | Elbows on the table, e.g. |
| 2003-04-27 | Smacking one's lips while eating, e.g. |
| 2003-03-24 | Taboo |
| 2003-03-01 | Cell phone ring in a theater, e.g. |
| 2003-02-17 | Taboo |
| 2002-12-02 | Using metallic dishes in a microwave, e.g. |
| 2002-10-13 | Slurping at the dinner table, e.g. |
| 2001-09-27 | Jumping a line, e.g. |
| 2001-09-07 | Inadvisable action |
| 2001-08-31 | Ringo Starr's "___ Song" |
| 2001-07-05 | Verboten thing |
| 2001-04-03 | Fudge, e.g., to a dieter |
| 2001-02-02 | Dessert, to a dieter |
| 2001-01-10 | Dessert, say, to a dieter |
| 2000-09-08 | Comment with a wrist-slap |
| 2000-05-29 | Faux pas |
| 2000-02-21 | Unacceptable act |
| 1999-12-28 | Eating peas with a knife, e.g. |
| 1999-11-03 | Rule breaker |
| 1999-10-31 | Inadvisable action |
| 1999-08-18 | Jaywalking, e.g. |
| 1999-07-11 | Jaywalking, e.g. |
| 1999-06-27 | Prohibition |
| 1998-12-01 | Forbidden thing |
| 1998-09-21 | Naughty deed |
| 1998-08-28 | Double negative? |
| 1998-07-11 | Proscription |
| 1998-04-28 | Forbidden fruit |
| 1998-03-05 | Thou-shalt-not |
| 1998-02-11 | Talking during a film, e.g. |
| 1997-12-29 | Taboo |
| 1997-12-24 | "That's a ___!" |
| 1997-10-02 | It's outlawed |
| 1997-07-14 | Taboo |
| 1997-06-09 | Banned act |
| 1997-03-24 | Taboo |
| 1995-11-24 | A don't |
| 1995-09-08 | Taboo |
| 1995-09-01 | Banned act |
| 1995-07-31 | It's off-limits |
| 1995-03-25 | It's frowned upon |
| 1994-12-26 | Taboo |
| 1994-08-27 | Ringo Starr's "_____ Song" |
| 1994-03-24 | Don't do it! |
| 1993-12-10 | It's forbidden |