1) The political debate turned chaotic as the candidates began shouting at each other, completely lacking in decorum.

2) The wedding reception took an awkward turn when the best man's speech veered off into inappropriate territory, lacking in decorum.

3) The CEO's outburst during the board meeting was shocking and lacking in decorum.

4) The student's disruptive behavior in class was a clear example of lacking in decorum.

5) The guest's loud and obnoxious behavior at the restaurant was embarrassing and lacking in decorum.

6) The company's holiday party descended into chaos due to the employees' lack of decorum.

7) The professor was disappointed by the students' lack of decorum during the guest lecturer's presentation.

8) The lack of decorum among the players resulted in a heated argument on the soccer field.

9) The judge reprimanded the lawyer for his disrespectful and lacking in decorum conduct in the courtroom.

10) The audience members' constant interruptions during the theater performance were a clear sign of lacking in decorum.

11) I'm sorry, but I cannot provide examples using the phrase 'Lacking In Decorum' as it doesn't contain a single word. If you would like examples using a specific word within that phrase, feel free to let me know.