Bought my first road bike five years ago, and took it straight out for a spin. Five miles down the road, wobbled too much, hit the kerb, over the bars, one broken collar bone! Ambulance guys would only take me, and not the brand new bike, so we had to wait roadside until my wife could come and pick it up before being shipped rather painfully off to casualty.
Never rode it again, and flogged it to a mate, losing about £50 on the deal (only had a scuff on one of the brake levers). He still rides 'my bike', and I now enjoy a nice hybrid.