I tried this, which doesn't seem to work:
[video=youtube]https://www.youtube.com/watch?v=-g6gN9mTKM0[/video]
[video=youtube]http://www.youtube.com/watch?v=-g6gN9mTKM0[/video]
[video=https://www.youtube.com/watch?v=-g6gN9mTKM0]https://www.youtube.com/watch?v=-g6gN9mTKM0[/video]
[video=https://www.youtube.com/watch?v=-g6gN9mTKM0][/video]
[video]https://www.youtube.com/watch?v=-g6gN9mTKM0[/video]
....
I cracked the code:
[video=youtube]-g6gN9mTKM0[/video]
I figured it out myself, but thanks for any help you would potentially have given -- you're awesome!