Here's a good technique. Whenever you notice something vaguely amusing or interesting (make an original observation about something normal, etc.) write it down. Collect these up and put them all in a video when you have enough!
Or tell the story of something you did recently, using sketches to exaggerate the comedy, and pointing out little details.
My problem is I have too many ideas and not enough time to use them...
I'm considering starting a thread with all my video ideas in it, in case some people want to use them. I don't know where to start the thread, though.
(Feel free to copy any video ideas you want from my channel. I'll be a bit annoyed if you get loads more views than me for doing the same thing, though, so I'd want credit for the idea in that case).