Hysterical laughter when high.
Captain Magenta is a fictional character, based on the animated puppet adventures of Captain Scarlet. Captain Magenta is Scarlet's camp evil twin brother, who, like Captain Scarlet, is invincible. This does not, however, prevent him from getting hurt. Which he does in abundance.
The appearance of captain magenta in circles of certain stoners can sometimes be a dangerous phenomenon, as the laugh produced by particular stoners is identical to the call of the heroin cult.
(After 5-20 minutes of solid laughter)
Liam: holy shit man, my sides.
Si: Captain M to the max.