I just realized that a lot of "Whose Line is it Anyway" games are pretty doable in thread form. So let's start with backwards scene!
Here's two examples in a five minute YouTube video (not necessary to watch):
Basically, we simulate a thread, but in reverese order. For the sale of simplicity, let's assume the thread was locked after the "last" post which I shall provide right now:
"Wait, was Loli serious about locking this thread?"