I found it! lol

Snippet from "How To Find An Exhaust Leak With Smoke Machine".

Here is a link to the full video: https://youtu.be/Q5Kdgt3mEZU

Disclaimer:
This is not an in depth how to video nor is it comprehensive. This is a video snippet taken from a larger video that contains a greater amount of information. This video is meant for entertainment and is not a diy guide. Please see video linked above for more context.