Boggart-Banishing Spell

So, not what is your boggart, but rather what would happen to it?

Like Neville and Snape, for example.

I don't understand why it was created and why is it taught like I mean it's not even real and there's like no use to it

I'm very scared of fires maybe my boggart would be a really huge fire and if I casted a riddikulus it would probably turn into a cute little baby penguin because they're cute.

And how would you make it look with the Ridikkulus spell? I ask because I think the scene in Prisoner of Azkaban where Professor Lupin teaches the kids about them is meant to make us question what we all fear, and encourage us to come to terms with it. (I'll tell you mine in a comment).

Who wants to listen to some Siriusly Riddikulus puns?

So when I face a Boggart, it usually turns into a massive spider.

But... I can't think of any way to make a spider less scary, let alone funny enough to confuse and banish a Boggart.

Ron Weasley's suggestions of removing its legs or giving it rollerskates just seem more scary to me.

Anyone have any ideas for vanquishing an arachnoid Boggart?