A business man started getting strange voicemails left on his office number. "The Viper is coming for you."
This occurred weekly for a couple months, and as the weeks went by he started to panic, checking all his business contacts for someone named "Viper", checking companies he'd dealt with of the same name. He had thought all his business dealings were on the "up and up." His search was fruitless.
One Monday, he got a voicemail. "The Viper's appointment is next Monday." Nearly out of his mind with angst and despair, he ordered his secretary to cancel all his appointments for the next ten days, and sequestered himself in his office, buried in his work. Every day, at varying times, he'd get a new voicemail, "Don't forget the Viper" or "Soon you shall meet the Viper".
The next Monday, bright and early, he got one last voicemail. He hadn't slept all night, hadn't showered in days, and he looked gaunt and sick from having not eaten in longer than he could remember. The voicemail said simply, "The Viper is coming today."
When his phone rang at noon, the voice said darkly, "The Viper is here."
The business man's sanity snapped, and he took the elevator to the roof to leap from it to END THE MADNESS.
There, he met a man in overalls with a bucket. "I'm the Viper, I'm here to vash and vipe your vindows..."