To scare the shit out of her when she turns it on.
I got a random cutout of a tarantula from the internet and this happened:

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4716178 Repost in TGD if you can cause I banned.

4716174 10/10 would scream again

4716174 If something like that was in my house the world would have to burn...

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4716747 I decided to take the joke one step further and tarantulabomb my entire house. Now I've got tarantulas in the ceiling lights, kitchen, basement, EVERY lamp, etc.

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4716819 But wouldn't that ruin the joke?

After two scares, I think that your mom is going to see what's going on and just ignore it afterwards.

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4716819

and just ignore it afterwards.

Ignore? I'd kick his narrow ass for every fake spider I would find...