When people drink alcohol, it may be easier to guess their background, as researchers found that it is difficult to control the way we pronounce words when we are drunk.
That means someone who is trying to hide their accent or lessen it, will end up unable to control it the more they drink.
"We slur our words, and it's harder to maintain the motor coordination and control needed for effective fine motor execution needed for speech production," Dr. Amee Shah, director of Cleveland State University's Research Laboratory in Speech Acoustics & Perception, said.
Shah also said the same is true when we are sick, as illness makes it difficult for us to focus on even the simplest tasks.
"As an Indian speaker, I have managed to modify my Indian accent on my own, but when I'm tired, or my lips are freezing in the outside air in winter, I find it harder to pronounce the sound "V" as in "Victor," as the easiest thing for my muscles and thinking is to purse the lips and say 'W,'" Shah said.
Though some people like to think accents are easily changed, studies show that our accents are deeply ingrained in us. One study found babies' cries show the beginning of their accent.
Researchers at the University of Wurzburg in Germany found in 2009 that babies in the first five days of life already show a regional accent.
French babies have a Gallic twang in their cries while German babies have a Teutonic quality.
This is likely due to babies listening, or "eavesdropping" on their parents' conversations while in the womb.