A 1999 British television commercial for Hoopers Hooch Lemon Flavour.
Synopsis[]
A mosquito flies towards a cliffside house. It bangs into the screen door and onto a patio table, where it finds a bottle of Hooch Lemon nearby. It has a sip from a puddle of the drink, which makes it strong enough to cut a hole through the glass. It flies into the bedroom as a man awakens from bed, hearing the noise. As soon as he starts to investigate, the mosquito bites him, making him yell in pain. The mosquito flies off, satisfied.
Why It's Cursed[]
The visuals look very uncanny even for the time, and the concept of it just reeks of paranoia fuel. The shot of the man getting bitten will stay with you for a long time.
Not to mention the horrible scream, that is...