Well, If you think about gene manipulation, a lab could take the sequence that is prevelant in the Hura crepitans which causes Explosive dehiscence. This in theory could yeild "explosive lemons". Before we get a bunch of Non-Practicing Biology Majors that claim "Genetically Modified/Engineered Organisms are impossible" Please remember we do have BT Corn. This Corn internally produces BT insecticide. Ignorance is not bliss. Look up a little company called Monsanto, they do a bunch of work in the GE world.