Parents may know what I'm talking about, I confess I did not until I looked it up.
Walking out of the train station tonight with my work bag slung over my left shoulder and carrying a - paper! go Albert Heijn To Go - bag of groceries in my right, I noticed two segments of a blister pack for medicines on the steps leading outside.
On closer inspection (picking something up on the stairs with said bags isn't easy, mind), there appeared to be pills still in them. The foil said "methylfenidaat hydrocloride", which didn't ring any bells, but I didn't think that it was a good idea to leave them there so I put them in my pocket.
Of course as it turns out, I probably needn't have worried about kids getting their hands on them. All the cool kids are taking them.
Googling* revealed it's generally known as Ritalin.
* Note the remark that the OED mentions the older verb 'to google', meaning to bowl a googly. I love the language of cricket.