Your language-teaching mission, should you choose to accept it, is to use YouTube videos to engage students in grammar practice.
A quick and easy way to use a YouTube video is to show and respond to it (no prep needed). However, if you're willing to put a little time in before hand, you can jazz it up for some fun times. All you need is a word document and the ability to take a screen shot (on Mac it's command+control+shift+4).
Step Zero (before students): find a YouTube video (either in the target language or one that is mostly silent, like Mr. Bean). For this case, we're using Le Grenouille Qui Était Un Prince. Take screen grabs of some interesting looking scenes. Make a word document, like this one: Le Grenouille Qui Était Un Prince Picture Story
Step One (with students): students make up sentences (using the grammar structure you want to practice) based on the pictures that they see (DO NOT show the video yet).
You can project the screen captures using a projector if you can only print in black-and-white (as I could only do). That way students can see detail. Encourage students to really stretch their imaginations, don't rely on stories they already know. For example, the first screen grab is of the king giving his daughter a golden ball, which she will lose, and a magic frog will save for her. Looking at the photo where father and daughter are hugging, we instead decide the sentence will be "La princesse (qui est un zombie) vole un bal d’or en mangeant le cerveau du roi." (The princess, who is a zombie, stole a golden ball while eating the king's brains). So, some imagination + using the present participle.
This is a great activity to do in pairs, or groups. Also super funny to share out, since they'll be unique (unlike the 'real answers'). You can even have students do a jigsaw activity, going around the room writing down their responses to each photo, and then go celebrate/correct their sentences before the second part of the activity. I like this because they get immediate feedback on the grammar structure before reinforcing it further in step two.
Step Two: Watch the video. Stop after each scene that the picture represents and have students write a sentence that describes what 'actually' happened. For example, "La princesse dit « merci » en embrassant son père." (The princess said thank you while hugging her father <--- told you it was less exciting than zombies!). This can be done as an extension/homework if students have access to computers to watch the YouTube video.
The sky is the limit, and once you've go the template, it's easy to replicate. I've done this with all sorts of stories, including, as mentioned above, Mr. Bean videos! (RESOURCE: Mr. Bean Picture Story with Si-Clauses) When I'm in a real rush, sometimes I'll reuse the stories for other grades/units, just swap in a new grammar concept. While ideally the video is relevant to the unit we're doing, sometimes you need to plan something for a substitute teacher at 1am, and this is an easy thing to create!