Editing practical - making a video funny and sinister

In my original video, a boy winks and points at the camera, takes a sip of wine as he's walking to a door and then walks through the door. I decided to edit it to make it look funny, and edit it another tine to make it look sinister. 

Funny

To make it funny, I added a 'ping' sound when he points at the camera and winks. I downloaded the sound and put it over the clip. 

I then got a grunt/groan sound effect, and I put it over the clip where he opens the door, as he did it by pushing it with his body rather than his hands.

Sinister

To make it sinister, I made the clip slow motion. I also added slow, scary music over the whole video, and when he is through the door I put a scream sound effect in.