LOL... I was almost dancing along with them on my seat. Below is sumthing I found while surfing around Youtube (at 4.30 in the morning >.> ), a video with a guy and 2 girls with a Nyaasu costumed character dancing to Polka O Dolka - ポルカ・オ・ドルカ meaning Do you dance the polka? (Polka odoru ka? ポルカ躍るか?) which was the second ending used in Advanced Generation series. Really funny so check it out...
[youtube]http://www.youtube.com/watch?v=Rxnz8TEjIf4[/youtube]
And here's the original animation of the ending theme, karaoke subbed for u to sing along too, and compare it with the above dance ;p
[youtube]http://www.youtube.com/watch?v=VPEi18yiW1U[/youtube]