Back in the 80s my ex-brother-in-law (and good buddy) lived a hundred yards from the DVP (Don Valley Parkway) in Toronto. Often we'd get hammered, hike over to the 200ft railway bridge adjacent to the Parkway and fire off a few bottle rockets into the valley below. Rather harmless fun.
But one night we took a few buddies with us and went past the rail bridge and got on to the big arch bridge over the actual DVP...watching six lanes of traffic zoom by below us at 100km/h. The bridge is maybe 40-50ft high over the Parkway.
One of the guys had brought a can of white spraypaint and decides to spray a 'Don't Drink and Drive' logo on the bridge over the southbound lanes. Seemed like a cool thing to do at the time - according to Jack Daniels.
So for a lark I decide to show off a little and climbed over the edge of the bridge and hung by one hand directly over the centre lanes of the expressway to finish the bottom of the logo. I (sorta) knew what I was doing...but it freaked the hell outta the other guys at the time.
But I finished the logo.
It looked good, too. City crews let it stay there for a few years - to this day you can still see the patch where they eventually covered it over.
Now in my 50s, in hindsight...it was probably one of the stupidest stunts I pulled.