First post and a shameless plug but I hope it helps some people out.
I see people leaving their PC's unlocked with browsers open all the time (sometimes over lunch at work!), putting themselves and their employer at risk. Installing a keylogger can be done pretty easily these days and then it's game over. Anyhow I created unlockedpc.com as a funny way to remind people that they should really lock their PC's when away from them.
I hope this will help save some peoples online wallets from being plundered. I will add more harmless spoofs for different OS's (kernel panic screen etc) when I have time. Also thinking of adding something generally helpful about two factor authentication and why everyone should activate it wherever it's available, but for now it's really just a way of making people think twice about their security habits.
Enjoy
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