James McAvoy and Michael Fassbender charm Patrick Stewart and Ian McKellen with impressions

Easily the best thing to come out of the first X-Men film was the beginnings of the Patrick Stewart/Ian McKellen friendship that has since taken the Internet by storm. Years later X-Men: First Class provided a catalyst for the charming off-screen chemistry between its stars James McAvoy and Michael Fassbender. Now X-Men: Days Of Future Past has reunited all four actors, not just onscreen, but in real life as well.

In a new Yahoo interview, Stewart and McKellen are paired off with their younger counterparts and ask the lads to do impressions. It’s difficult to pinpoint the most delightful moment in this short video. Is it Fassbender and McKellen cracking themselves up?  Is it the way Stewart giddily reacts to McAvoy’s impression? Is it McKellen slipping into Fassbender’s posture?

Ultimately, however, the most charming thing is probably the fact that McAvoy inadvertently reveals the depth of his Star Trek love. When Stewart suggests he imitate the famous “Space, the final frontier” monologue that opened the show, McAvoy instantly panics: “Don’t! You can’t! That’s a massive thing for me. You can’t! I’ll cry.”