It’s a joke. Drugs are no laughing matter. Laughter itself however is fascinating and a bit of an enigma. We all know what it sounds like and we can even tell whether it’s genuine or not, but it’s what happens in the brain and how it evolved that is still a bit of a mystery. This article from Brainfacts.org has a great run down of what laughter is, and who does it (it’s not just humans). And while the actual science behind the phrase “laughter is the best medicine” is rather questionable it can’t hurt, especially when it is shared. So find a friend, have a laugh, and read more comics.