Ok, zacster, listen to this. A long time ago, when I was still racing and training on tubulars, about this time of the year, I took up road training again, preparing for the season. Got a couple of tubular shod wheels that were leaning against a wall close to the heater, put them on my Visser Vainqueur, and off I went.
On my usual ride I had to pass more than traffic light, so naturally, when its red, you just have a quick look, no-one's coming, just a quick sprint out of the saddle to pass that crossing will do. So thats what I did ..

Hey, why am I hearing a loud bang, and looking at the tarmac from about 2 inches? I'm lying on the road, face down, cheekbone and chin resting on same tarmac. What happened? When sprinting out of the saddle, of course you swing the handlebars a bit from left to right. This (easily probably) made the front tubular come off, which would not pass through the forks once it arrived there. Bike stops abruptly, throws me over the bars so quick I dont even notive it, makes me land face down on the road. I still have some small scars to show for iot ..

Tubulars are glued! Glue dries out! Test everything before you go out on the road, and by the look of it, that tubular needs glueing again! If it holds up to the removal procedure of course ...