I'll go for the following
(To be sung at stadiums of various sizes, the larger the better)

My garden shed! (My garden shed!)
Is bigger than this! (Is bigger than this!)
My garden shed is bigger than this....
It's got a door, and a window.
My garden shed is bigger than this!

Apparently there are dance moves involved and everything,
( JeffTheDogFucker Can you dig it?, Wed 16 Feb 2011, 0:07, 1 reply, 15 years ago)

but what is the tune?

(porkylips looks better as the sun goes down., Wed 16 Feb 2011, 0:10, Reply)

Have a listen.
I'm not a Villa fan, but it's quite clear here.

fanchants.com/football-songs/aston_villa-chants/my-garden-shed/
( JeffTheDogFucker Can you dig it?, Wed 16 Feb 2011, 0:13, Reply)

Ah the old "Oh when the saints" tune. A serviceable old warhorse is that one.

(porkylips looks better as the sun goes down., Wed 16 Feb 2011, 0:16, Reply)

This still gets a regular outing
fanchants.com/football-songs/bristol_city-chants/palace-family/
( JeffTheDogFucker Can you dig it?, Wed 16 Feb 2011, 0:17, Reply)