We had one going the wrong way on a 6 lane road right across the top of the off-ramp onto the interstate the other morning. At the peak of rush hour. Without a helmet. While drivers were turning right all around him to get onto the ramp. 
He did not seem to be sniffing glue, at least.
I literally had to keep blinking to verify that I was actually seeing what I was seeing.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow