From the moment two people meet, they're sizing each other up, looking for signs of qualities like honesty, intelligence, and altruism.

Whether it's a date or a job interview, the small stuff matters — from the firmness of your handshake to how often you check your phone.

People may judge you based on the way you drink.

1. Your handshake

Several Quora users admitted they judge people based on their handshake.

"Strong handshakes usually reflect a strong and confident character, whereas weak handshakes usually indicate a lack of confidence and are almost always a characteristic of people who would look for an easy way to do things," writes Julian Parge.

Research backs up the idea that your handshake can reveal certain aspects of your personality: One study found that people with firm handshakes were more likely to be extroverted and emotionally expressive and less likely to be shy and neurotic.

2. Whether you show up on time

Late for a very important date? The person who's waiting may be forming a negative impression of your personality.

"A proactive person will be there on time, because he is self-motivated, mentally organized, and values time whereas a procrastinator will be running here and there at the last hour," says Humaira Siddiqui. 

According to science, those who are chronically late aren't necessarily inconsiderate people — but they're probably more laid-back, "Type B" individuals.

3. How you treat restaurant staff

Multiple users said they pay close attention to how other people interact with waiters. 

"I will never, EVER date a man who is rude to restaurant staff," says Sati Marie Frost.

Even top execs say you can learn a lot about someone based on the way he or she treats waiters, hotel maids, and security guards. Ron Shaich, CEO of Panera Bread, says he once declined to give someone a job partly because she was nice to him but rude to someone cleaning the tables nearby.

4. Where you look when you drink out of a cup

Writes David Junto: "A person that looks into the cup when drinking tends to be more introspective, self-aware, idealistic, and focused. A person who looks over the rim of the cup when drinking tends to be more influenced by others, more environmentally aware, carefree, extroverted, and trusting. A person who closes their eyes when they drink is in some sort of pain or discomfort and is preoccupied with pleasure and relief."

And don't even get started on what your drink choice signifies.

Flickr via fixemResearch suggests that people who bite their nails are more perfectionistic.

 

5. Whether you bite your nails

Sushrut Munje has strong views on people with bitten nails, saying that it's a sign "the person eats away at himself."

Meanwhile, research suggests that those who bite their nails (or pull their hair, or pick their skin) tend to be perfectionists, unable to fully relax.

6. Your handwriting

Whether you're writing a to-do list or a love note, your handwriting can say a lot about you.

Ramesh Nagaraj believes that "people who put a lot of pressure on pen and paper to write something are usually stubborn in attitude. They have a lot of confidence."

Meanwhile, professional graphologist Kathi McKnight says large letters indicate that you're people-oriented, while small letters suggest you're introverted. Letters that slant to the right can mean you're friendly and sentimental; those that don't slant at all might mean you're pragmatic; letters that slant to the left suggest you're introspective.

7. How often you check your phone

An anonymous Quora user writes about noticing "where and when [people] pull their phones out (waiting in a short line, talking to their parents, being out with friends, when they're alone in public)."

As for what it might mean if you're constantly refreshing your email or Facebook feed, one study found you may be less emotionally stable and trying to boost your mood.

8. Whether you make eye contact

Munje says a limp handshake and a lack of steady eye contact "shows lack of self-control, required drive to follow through, and a weak will."

Alternatively, psychologist Adrian Furnham, Ph.D., writes in Psychology Today that extroverts tend to look more often and for longer at their conversation partners than introverts do. And in general, people who look at their partners more often are more confident and socially dominant.