Zachary knew that he wanted to have a police-themed birthday party. And he also knew that he wanted the police to be invited.
But the 5-year-old didn't realise calling 111 wasn't the best way to send an invite.
After his mum profusely apologised to the police for her son misusing the emergency phone line, some off-duty police officers thought it would still be a good idea to surprise him anyway.
Check out the vid above of the hilarious phone call and awesome moment they showed up to surprise him.