Dream of person

I have never met this person before in real life only seen them around ... but 3 people were dressed in "Scream" costumes and trying to pull pranks on me, one of them tracked me down put a knife to my stomach then ran away. Later on I escaped to a party at my parents house with lots of relatives and this guy who I know from real life was there, he told me he was the one in the scream costume playing pranks on me. He then told me something I had not told anyone about and I asked him if i had told him and he said no he just knew.