Tom Lehrer
The Old Dope Peddler
When the shades of night are falling
Comes a fellow ev'ryone knows
It's the old dope peddler
Spreading joy wherever he goes
Ev'ry evening you will find him
Around our neighborhood
It's the old dope peddler
Doing well by doing good

He gives the kids free samples
Because he knows full well
That today's young innocent faces
Will be tomorrow's clientele
Here's a cure for all your troubles
Here's an end to all distress
It's the old dope peddler
With his powdered ha-happiness