Goosebumps

Carly Beth, who believes she has found the best mask for Halloween-with long animal fangs and yellow-green skin-soon discovers that she cannot take it off.

Gary doesn't have any friends, bullies are constantly beating him up, and even his little sister doesn't like him, which is why he is so excited about exchanging bodies with another kid. But something horrible happens and he finds out his new body isn't human.