Everyone seems to like the yellow bird one, well here is the yellow bird that i know:

A yellow bird
a yellow bird
with a yellow bill
with a yellow bill
was sittin on
was sittin on
my window sill
my window sill
i lured him in
i lured him in
with a piece of bread
with a piece of bread
and then i smashed
and then i smashed
his little head
his little head
oh god
oh god
i'm such a clutse
i'm such a clutse
i missed his head
i missed his head
and i smashed his nuts
and i smashed his nuts
now there is a bird
now there is a bird
in a bush
in a bush
who cant get laid
who cant get laid
his nuts were squished
his nuts were squished