This might be a reference to the Japanese dub of Beast Wars. Sometimes the show had the voice actor ad lib some lines for comedic purpose and sometimes there is an ad lib during the ED segment.
And i think they did the same thing too on their dub of Transformers:Animated
Noisy!Episode 4 script"From here on, ad-lib your way through the script by saying anything funny for 30 seconds"!?Oh my~The hell with this shitty script!? Are they just toying with me!?KanColle X TF
Episode 4 script