One of the most powerful ways to spark Involuntary Curiosity in students is to strategically trim a video clip to either remove content or present an unresolved representation of the content. Both of these techniques leave students with questions as to what information was missing, or what the final result will be.
Because internet speed and access to YouTube varies in schools, downloading the desired clip from YouTube, then strategically trimming the video to be played locally is a powerful technique. I often have a trimmed clip playing on repeat loop in Quicktime as students enter the room in an attempt to grab their attention and spark their curiosity immediately.
Below is a short video outlining how I download and trim video for curiosity using technology I use savefrom.net & Quicktime. In this video I am downloading a clip from the movie Fight Club in an attempt to spark student questioning around Acid-Base Chemistry.