Screaming Purple Jesus (thing)

Alternatives to the above are:

from www.webtender.com
• 4 parts Grape Kool-Aid
• 1 part Everclear

or

Equal parts of:
• Ginger ale
• Grape juice
• Vodka
• Grain Alcohol

That last one I found as just Purple Jesus, but I'd say both would be enough to make you scream. Cheers!