Teenaged babysitters having bad nights are a very popular theme among horror shorts--possibly because of the model set by "Halloween", but also because the bedeviled babysitter is herself a horror trope... and one around which all kinds of things can be built.
Here's one of the better ones of a huge selection floating around out there.
Red Balloon (2010)
Starring: Rachel Bright and Niamh Palmer Watson
Directors: Damien Macé and Alexis Wajsbrot
Rating: Seven of Ten Stars
