Need help with Rube Goldberg project! Bubbles and fan!?

I have completely messed up my project. I though putting little drops of dish soap while a fan is turned on would make bubbles (seen it on a commercial) but now it doesn't work and I am terrified because I only have two more days to work on it. I have everything else planned out but I need something else. A marble will knock down some dominoes and that's it! Please helppppppp

Maybe it could turn on the fan? If so, I need help anyway. What can the dominoes knock down that would turn it on?

A domino can trigger a mouse trap. The metal bail of the moustrap can be used to complete an electrical circuit.

Domino can fall onto a lever which then sets a metal ball rolling onto a set of contacts.

For lots of videos search for Pitagora Switch or Pythagora Switch. The Japanese TV network NHK has a kids program they advertise using rube goldberg setups. Lots of examples

Here is a video that might give you some ideas.

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