although i agree with david's reply that trailers for films are customized according to the time of day in terms of their rating ie u,pg,12,12a,15,18, i question why 'it chapter 2' comes up at all when someone searches for a disney cartoon.
i am no prude by any means, but would suggest to jpcm24 that he contacts ofcom to 'register' a complaint.
if someone is searching for a disney cartoon, at no time should any trailer for an adult horror film pop up even if it is watered down in line with the time of day.