Engage your students in an opposite clothing race. Fill two bins with clothing and accessories; pants, shirts, jackets, hats and so forth. Divide the class into teams and place the bins on the floor next to each team. On your mark, the first two players on each team must put all of the clothing and accessories in the bins on backwards. Once dressed, the players must run to the opposite side of the room and touch the wall. After touching the wall, they must run back to their teams, take off the clothing and tag the next person on their team. The first team to have each player complete the task wins the race.
Practice spelling words, but spell them in an opposite order. State spelling words and go around the classroom, asking students to spell the words backwards. It's ideal to use words that your students are very familiar with spelling instead of new or tricky words, as spelling backwards can be quite a challenge. To make this game a competition, you can divide your class into teams and award points to the team who correctly spells the words in opposite order first.
If you follow a schedule in your classroom, reverse the order of the schedule for opposite day. For example, if your schedule consists of morning meeting, reading, social studies, free time, math and science, reverse the order on opposite day and do science at the start of the day and the morning meeting at the end of the day. Your students will be quite surprised by the mix up of the routine.
Have an opposite read aloud. Gather your students around and read them a book in opposite order. Show students the back of the book and ask them if they can predict what the story will be about based on this cover. Read the last page first and work your way to the front of the book. Ask students if they can make sense of what was read.
Play a game of opposite musical chairs. Arrange chairs in a circular formation, as you would in regular musical chairs; include one less chair than the total number of students. Instruct students to walk around the chairs backwards and without any music. Play music and upon hearing the music, students must try to find a seat. The player who doesn't find a seat is out of the game. In regular musical chairs, students would walk forward in a circle while music is playing and try to find a seat when the music stops. Continue playing, removing one chair with each round of the game, until there is only one student left.