Drama? Discouragement? Distractions? Encourage your students to leave it at the door - it will will be there to pick up on the way out if it's needed, or they can leave it behind and get on with their day. If you just need an encouraging poster, hang anywhere, but if you'd like a fun classroom culture-building habit, encourage students to tap the poster on the way into class each day and leave any negativity at the door.
Photo by Annie Spratt on Unsplash
For other culture-building activities:
Mood Meter Chart: https://www.teacherspayteachers.com/Product/Mood-Meter-Clip-Chart-for-Classroom-Culture-and-Management-3963010
Classmate Bingo: https://www.teacherspayteachers.com/Product/Classmate-Bingo-Back-to-School-Activity-3958155