The Funhouse (1981)

Rebellious teen Amy defies her parents by going to a trashy carnival that has pulled into town In tow are her boyfriend Buzz and their friends Liz and Richie Thinking it would be fun to spend the night in the campy Funhouse horror ride the teens witness a murder by a deformed worker wearing a mask Locked in Amy and her friends must evade the murderous carnival workers and escape before it leaves town the next day