A particular treasure found in the Frontier Cavern in the second game. It's a star-shaped Christmas tree ornament, nothing harmful about that, right? Well, it's got a little knob between two of the rays where the ornament string would normally be attached. Maneuver the camera at the correct angle, and this knob suddenly looks a little... odd. The treasure's name? Innocence Lost.
The "Arboreal frippery" bears a striking resemblance to a marijuana leaf. In the Japanese version, Olimar even expresses a desire to try it some day.
It's allegedly supposed to be the leaf of a Japanese maple tree, which admittedly does bear a resemblance to marijuana, however it doesn't exactly match it. In any case, the European release changed it to a Canadian maple leaf.