Ideas for Short Film

I have my heart set on doing a mockumentary as I really like the style that they are shown in. I've had a few ideas which I feel could be successful as mockumentaries.

• Santa Claus - A mockumentary about Santa's life now that the world hates him after he did something (undetermined) wrong. He has become a bit of a drunk, he doesn't care about his looks anymore, etc. It would follow him in his day-to-day life, coming over confrontations with his haters.
• Grammatical OCD - This idea came to me when I was talking to a friend and I had to correct them on their grammar. The mockumentary would follow the life of someone suffering with ocd, who feels the need to correct everyone who is grammatically incorrect.
• Wildlife Documentor - I was watching a wildlife documentary with David Attenborough and thought that I could do a mockumentary about a boy who is convinced he's David Attenborough and documents everything he sees as though he were in fact David Attenborough.