Please get the last one. If you did, I'm so sorry...My phrasings might have been weird as well.
Source: Episode 23 of Shingeki no Kyojin (English name: Attack on Titan)
Character: Annie Leonhardt
Context: Main characters are trying to get her to get her to enter an underground tunnel (the "other hole"). She refuses, some stuff happens/ is revealed, then she completely loses it. This laughing scene did not happen in the manga (she just made a weird smile showing her teeth and maybe made a chucking sound).