GREENVILLE -- The Skinny Dip sandwich at Greenville's Black Frog Restaurant is free for customers willing to plunge naked from the restaurant into Moosehead Lake.

But three diners could soon learn that the fine for indecent conduct carries a cost.

Greenville police issued summons to three friends who took the plunge last weekend in return for a sliced prime-rib sandwich.

Twenty-five-year-old Crystal Stilwell, of Bath; 31-year-old Bernard Beckwith, of Windham; and 37-year-old Christian Simpson, of Bethel, have a Sept. 15 court date.

The trio dashed into the water at about 5 p.m. in full view of other diners. Restaurant owner Leigh Turner said all 40 to 50 patrons were asked in advance if they would be offended by the plunge, and nobody objected.

But Greenville Police Chief Scott MacMaster said a family standing nearby was offended and contacted police.