Domhnall Gleeson appeared on last night's Late Late Show and was chatting to Ryan Tubridy about new movie release, Goodbye Christopher Robin.
Gleeson plays lead character A.A. Milne.
However, Ryan had a few tricks up his sleeve to surprise Domhnall, the first being a video of his performance in Grease! the musical whilst in school.
However, the surprises weren't over there with Ryan pointing out that Domhnall's music teacher Ms Keogh was sitting in the audience.
Gleeson said "Ms Keogh was my music teacher, who was an amazing, amazing woman and an amazing music teacher and really made my life better when I was in school."