Worms
She was called the Witch Princess for a reason, and neither witches nor princesses would ever be outdone. Especially on this day of all hallowed day. A bowl of brains? Pssh; don't make her laugh.
She blinded folded the children and held the bowl in front of them. They giggled at the feel of slimy appendages wiggling between their fingers. Their giggles abruptly stopped when she took off their blindfolds. They screamed at the sight of live worms, millipedes, and other creepy crawlies supplied by her niece.
A little birdie informed her that Jin later diagnosed the children with vermiphobia.
Wow...I just realized that this is my longest continuing story, for two years now. Weird...