I hope you can help me remember the name of this book! I believe all of the stories were written by the same author, but I'm ready to be proven wrong.
In one, maybe the longest, a boy graffitis the Egypt exhibit at the (British?) museum. The museum curator is revealed to be Anubis in disguise, and mummifies the boy alive.
In another, a kid who is trying to prove he is badass is dared to stay in the cemetery overnight. He paints his face to scare his friends, but before they find him he is attacked by a vampire. He is saved by the vampire's mother, who chides the vampire on not gunking his teeth correctly and being too tidy (compared to the boy's mother who chides him for being too messy). At the end of the story his friends find him laughing and wiping his face, saying "they're just like us!"
In another, a girl feeds the lake behind her house a spoonful of honey each day to keep it happy. Eventually her abusive father intervenes and the lake takes him away.
In the last, a ghost of a peasant boy haunts his old estate. His only desire is to try a sugar stick, a delicacy the lord of the manor partook of but the peasants never got to try. He makes contact with a girl, who gives him a taste of her candy, which he hates. He's like I can't believe people eat this! I waited around for this?? And then his ghost is set free.