Is it normal hear something in your friends voice, but he says he didn't say it

I was watching a movie with my friend on my computer. It was in the middle of the movie and i heard him say "pause it" So I did, and he said "why did you do that?" I said "Because you told me to pause it" he told me he did not say anything and I got really scared and now I think I have a psychotic disorder. It was most certainly a hallucination, but I just want to know if anyone else has ever had one of these experiences. I think I might have schizo or bipolar. I am scared so please help me out. :) much appreciated.