Well if you have a spoiler in the middle of the sentence, instead of just a black bar going over the spoiler, and if you put your mouse over it, the text shows up, it does something like this:
And then at the end of the movie when
[ everyone dies and their balls fall off ]
i was jumping out of my seat.
Instead of just a smooth:
And then at the end of the movie when [everyone dies and their balls fall off] I was jumping out of my seat.