The challenge: use a single sound repeatedly. A repeated sound can become unpleasant very quickly, which creates tension and suspense in this short surrealistic video.
The main figure is placed in changing and melting environments. Threatening laughter is heard as glimpses of distorted faces fade in and out. For those, I used NewBlue’s “Water Flow” filter. I feel the waviness of the shapes are more effective than static distortions to suggest a dream, mirage, or mental disturbance.