Talking to Yourself
IDK if this happens a lot now but, have you seen moments that a seiyu is talking to himself? simply put a seiyu that dubs two voices talking to each other.
Sakata Gintoki(Gintama) talking to Usui kazeyoshi(sket dance) CV:Sugita Tomokazu
Itoshiki Mikoto & Itoshiki Nozomu CV: Kamiya Hiroshi