I have only drank and drove twice in about 6 years of driving.
The first, was when an ex offered me her bottle of water after class at university. Looked like water, but it sure as heck wasn't water. We were going to the movies right after class. Probably under the legal limit at the time.
The other, my 18th, had to move a friend's car after he was even more shitfaced than I was, not that I'm a big drinker anyway. Only drove it about 30 m though to move it out of the way. Probably bordering the limit.