[caption id="attachment_166358" align="alignnone" width="300"] Three parents contacted the ASA to say their children had been distressed by the ads [/caption] Children were left distressed after seeing ads for a horror film on YouTube, the Advertising Standards Authority (ASA) has revealed. Three parents contacted the ASA after their children saw ads for Insidious: The Last Key - rated 15 in the UK. One ad for the film was shown before videos of songs from Frozen, instructions for building a Lego fire station and a clip from the cartoon PJ Masks. The ASA has upheld the complaints. In a second ad, the ASA said a young woman was seen "lying on a floor immobile, bloodied and distressed while a humanoid creature crept…