Where can I get some novelties?

There's a place just for this purpose.

It's the novelty "shop" on the docks in Ankh-Morpork.

Although you can't get inside, the wall is kind of thin.

All you need is something to knock it down.

You still need a fair amount of force, though.

Find something pretty heavy.

Like a weight.

There's a one ton weight in Holy Wood.

And if you look at the docks, there's a way of getting the leverage you need
to use the weight on the wall.

You can hang it from the hook on the docks, and then use the weight to knock
down the wall.