Group storytell, but you can only peek at the last line. You can only contribute once, so spread the word about this thread and nominate people to add their bit. After contributing, you may view the entire thread. Put your lines in spoiler format. I'll go first. Spoiler I opened the jar of mustard and inhaled it deeply.
I'll continue from rktho's line. Spoiler Almost immediately, I felt tingling all down my spine. The next thing I knew, I'd been turned into a mouse. Mustard my ass. I looked up the table leg, which was now at least ten times my height. What the hell was I supposed to do now? Re the spoilers - you click "insert" and then the options drop down and you select "spoiler" - click "continue" when you see it prompt you for a spoiler title (you don't have to write a title if you don't want) and then just write whatever you want within the spoiler tags, and post.