Cat in the morning

I had quite an interesting night/morning with a massive fright in early morning. I was half asleep most of the night but heard a noise near my window around 5am. I partially opened my eyes and didn't really see anything and started to close them but then heard more noise over by my window and opened them wider. My heart started racing and I hadn't heard these noises before which sounded like tapping on my window! My heart started racing as I thought someone was trying to reach in through my open window. I was fully awake at this point and there was just enough light coming through the window to see a pesky cat sitting on my computer desk and rustling around. Jesus it scared the living daylights out of me! I started moving out of bed and it got frightened and tried to go back outside the window but couldn't fit through this time. I went up and it tried to get out by jumping but then fell behind my computer dragging the mouse and wireless card with it. It got up and hid under my desk. As I reached down it hissed and swatted at me. I was hoping I could grab it by the collar of its neck so it wouldn't bit me or scratch me (at this point I was thinking "stray cat? Bite? Rabies? I hope not!" anyways, I had to get it out of my flat and I pinned it to the floor and tried to grab it a few times successfully nabbing it the fourth or fifth time. I opened the window as wide as I could and pushed it out and slammed it shut. Blimey, that was not a fun morning! Poor thing must've been scared to death being trapped in my flat but it scared me too!!!