I was posting a link to a video on funnyordie.com, and put it on a new line to try to embed the video.
Instead, it caused the browser to redirect to the link as soon as the post loaded. As the redirect happened immediately, it was very difficult to select the post to edit/delete in order to remove the link.
I’m not sure what can be done about this, except disabling embeds from the site.
Here’s the link I was using: Daddy’s Boy from FunnyguyMan