Prune ice cream is a type of ice cream that Mermaid Man orders from E.V.I.L. (consisting of Barnacle Man, The Dirty Bubble, and Man Ray) in their ice cream truck in the episode "Mermaid Man and Barnacle Boy V". Patrick also eats this flavor in the episode "Old Man Patrick", and GrandPat eats it in the The Patrick Star Show episode "Enemies á la Mode".
In "Mermaid Man and Barnacle Boy V", it is light purple, prune-flavored ice cream and is served in a cone with bran sprinkles and a lit-up fuse. In "Old Man Patrick", it is dark purple ice cream that contains prunes and is served in white bowls.
Role in series
When Mermaid Man sees the ice cream truck, he orders a double scoop of prune ice cream with bran sprinkles from E.V.I.L. One of the members, Barnacle Man, gives him what he ordered, except with a lit fuse on it. When Mermaid Man eats the ice cream in one bite, though, it explodes, leaving a hole in his stomach.
After Patrick realizes Squidina can help him get Ice Cream from Walter, GrandPat tries to tell them he has ice cream hidden in a clock. GrandPat then eats the ice cream himself revealing it is prune flavor.