Officers were called after cries were heard from an apartment in the city of Mainz in the early hours of Saturday.
Police found the 58-year-old tenant and a 61-year-old visitor "hopelessly locked together" with the toy car and the mannequin - which was dressed in a knight's costume.
Officers were able to free the men, who were too drunk to explain how their unfortunate predicament had come about.
According to a police statement, "the whole thing would have remained a funny episode" but the younger man was "more than impolite" and now faces a charge of insulting officers.
Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.