The Situation's Dad -- Targeted for Water Torture

5/19/2011 4:00 AM PDT

The Situation's Dad Frank Sorrentino -- Hit Me with Your Balls!

If you've ever wanted to throw something at The Situation's dad, now is your chance -- because TMZ has learned, the foulmouthed father is putting himself in a DUNK TANK ... and it's all for a good cause.

Sources close to Frank Sorrentino tell TMZ, the man volunteered to make himself the target in dunk tank for charity this Saturday -- raising money for the Plumosa School of the Arts in Delray Beach, Florida.

And get this ... we're told Frank isn't just the honorable dunkee -- he and his pals also DONATED the dunking contraption just for the event.... at the Delray Beach Family Fun & Local Business Expo.

Time to warm up that pitching arm.