Not that you really want to ... it's no more fun than standing on the ground. Much better to ride a bike with handlebars, than use them as a stool.
But the bars weigh 180 grams, and I weigh about 210 lbs. I was able to stand on them without hearing them crack. No visible damage from the experience.
I think carbon fiber is strong enough for Clydes and Athenas to ride as a frame material.