G&S style

I am the very model of a disembodied headical
eating up the pellets, dots and ghosts until their deadical
When day is done I return home to boink Ms P in bedical
(chorus)
When day is done he returns home to boink Ms P. in bedical

R&H style

Chomp every pellet
Eat pinky and inky
Swallow every fruit bonus
Till. You. Reach. Kill. Screen.

Sondheim style

Into the maze you have to go
with fruits and ghosts and dots in tow
Into the maze get on your way, you must begin your journey
Into the maze and out of the maze and home before dark

-or-

There's a hole in the maze like a great black pit
And it's filled with ghosts who are filled with shit
And the vermin of the world inhabit it.
But not for long...

They all deserve to die.
Tell you why, Mrs. Pacman, tell you why...

awwww, cmon guys, PACMAN! MRS. PACMAN EVEN!