Not 2.7, no. A person would die before reaching a blood alcohol level (BAC) that high. Perhaps you mean .27, which is considered very high, but not uncommon. Alcoholics frequently register BACs of at least .27, simply because their bodies have habituated to alcohol, and they are able to consume more than light-to-moderate drinkers. Most people would be "falling down" drunk or unconscious at .27.
The following list of facts is from the Drug Abuse Recognition site (Related Links):
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At between 1.6 -1.9 BAC most people feel depressed and discontented. Nausea may be a problem. The drinker generally becomes a sloppy, emotional drunk.
Note: This applies to naive drinkers. Alcoholics can tolerate these levels with less outward affect. However, this does not mean that they are sober.
Anything over 1.0 percent would in most cases be fatal. No one could survive having a 1.7 Blood alcohol level. 0.08 is the legal limit in most states which is approximately 2 drinks in a one hour period. 1.7 BAC would be approximately 30 shots in a one hour period.