The explanation for giggles or in the scientific term chuckles can be easily explained.
The psychoactive ingredient in cannabis is THC. THC stands for Tiny Hands and Chuckles. You see, when you ingest THC, it moves throughout the body and converges in the area of the body containing the tickle bone. When the Tiny Hands interact with the tickle bone, you get chuckles hence, THC.
Now if you get a boner, well you figure it out. S