During the filming of Professor McGonagall's dance lesson scene in the Harry Potter series, a hilarious prank was pulled on Rupert Grint by the Phelps twins, who played Fred and George Weasley. As natural pranksters on and off-screen, the twins decided to have a little fun with their co-star.

According to behind-the-scenes stories, the twins convinced Rupert Grint that he had missed out on learning an important dance routine for the scene. Grint, who played Ron Weasley, was known for his laid-back and easygoing personality, making him the perfect target for the twins' prank.

Falling for their trickery, Grint was left feeling confused and worried about how he would possibly catch up on the routine he supposedly missed.

The prank not only showcased the mischievous nature of the Phelps twins but also highlighted the close bond between the cast members of the Harry Potter series. Despite the intense filming schedule and long hours on set, the cast always found ways to keep things light-hearted and fun.

In the end, Rupert Grint realized he had been pranked and joined in on the laughter with his co-stars. The camaraderie and friendship among the cast members helped create a magical on-screen chemistry that fans of the series continue to love and appreciate to this day.