Push it Real Good
From A KoL Wiki

You enter the room, and see nothing but a very very very very very very large statue, sitting exactly where the stairs down should be.
"Gosh, what a fiendishly difficult and original puzzle," you think, as you also think the exact opposite.
You want to push the statue around, and so you do. You want to push it down, and you do. You then take it for granted and go down the stairs.
Occurs in Fernswarthy's Basement.