So this was a fairly random idea that was probably funnier in my head, but here it is anyway!

Original music "Smile, Smile, Smile" composed by Daniel Ingram.

The instrumentals are provided courtesy of Mandopony:
http://www.youtube.com/watch?v=UUOSulm9YRA

The Pyro vector thanks to the awesome talents of enon013 of DeviantArt:
http://enon013.deviantart.com/art/TF2-Vector-Pyro-152151317

And the Pinkie Pie vector thanks to the wondrous abilities of ikillyou121 of DeviantArt:
http://ikillyou121.deviantart.com/art/Pinkie-Pie-Vector-257263867

Lyrics (by request):
Mhna mn mna mnn (mhoh!)
Mhn mn mhne mn mn (hm n hnin?)
Mnd mnhn mhh mn mhln mnhn mn mhna mm mn mha

Ihn hnm mhna hm (hna!)
Ihm hu hm hnn hn hnn (hny!)
Hn hnm ha hu hnn hna hm hna hn hnn hm

Hn ha hn mu hn hu hm hm hm
Hn na hu
Hn hna hn mna hm ha hm
Hn na hn
Hn ha hn hn ha na hm mn mm
Hn na hma mn na mm

Hm nn mn hn a hm (hnha!)
Hu hma hn hn hm (hu hya!)
Hm hna hnn nn na nuna hm hna nn nm mm (nn mm!)
Nm nf hm hma mm mm
Nn ha hm hm hn ha hm
Ha hf hmn hm hn hu ha hn hu hn ha han hun hu hn hnn

Hu hy hn hu hy hu hn hnn hm
Hn na hu
Hn na hna hm hn nn nn nm
Hn nnn na mn na nm nn na nnm
Nn na nn nn mn na nm

Mn nn hu nmn na nn nu ny
Nn nuny nn ny na
Nu nynu na nyna na nn mu mo nu na nn nmn na nn
Mn nn nm hm na ny hmy n hm hn m n muna
N na mnn ny nn mu my mnn n nn nu mymm

Mm mnm mm nu mamy
My mm mna mm
Mm mn a mnm
Mm nm a mnm
N mnn mu mna mu ny

Hy nn mu ny mu mm mm mm
Hn na hu
Mm hn my hn hy hnmn nn ma nn
Hn na hn
Hn na nn na nn hm mm mm
Hma hm mm nn mm nn mmm

Nn nn mnmnm muny
Mmyu mmyu mmyu
Mm my mm mu mm hna, hna
Hn hy hny mm hn
Mmyu mmyu mmyu
Mmn ny hmy mnn na mnn

Nn nn mnmnm muny
Mmyu mmyu mmyu
Mm my mm mu mm hna, hna
Hn hy hny mm hn
Mmyu mmyu mmyu
Mmn ny hmy mnn na mnn

An na mna mm mu me
Mn a mmyu an myn myn an a mynu
Mu mana mny mn nn ny

Mmyu, mmyu
Mmyu, mmyu
Mmyu

Mn nn n mmyu
Mn nn n mmyu