Jack Donaghy may be a smarmy businessman on 30 Rock, but his thoughts on handshakes are actually quite accurate. The way you shake someone's hand can really reveal a lot about your personality, which might not bode well if you're looking to make a great first impression. To find out what your handshake reveals about you, check out the list below:

1. Politician

Signature move: A firmly grasped handshake that involves using the other free hand to cover the handshake or placing it on the forearm or shoulder.

Personality Type: This person most likely trying to create a false sense of sincerety. Do not trust him.

2. Sweaty Palms

Signature move: Wet hands.

Personality Type: The person is super nervous about something, resulting in sweaty palms. Do what you can to put him at ease.

3. Dead Fish

Signature move: Feels like shaking a limp noodle.

Personality Type: This type of clasp usually indicates indifference. Exceptions to this rule are musicians and surgeons, whose bery livelihood depends on protecting their sensitive hands from being mangled.

4. Hand Wrestler

Signature move: The hand is taken normally before being twisted under the other person’s in an aggressive manner.

Personality Type: This person is absolutely committed to coming out on top, regardless of what they say they want.

5. Finger Vice

Signature move: Instead of your entire hand, this person just goes for the fingers.

Personality Type: These people are often insecure and like to keep others at a distance. They also tend to crush your fingers as a way to show personal power. Try to be deferential to them.

6. Bone Crusher

Signature move: Squeezing your hand until you cringe.

Personality Type: This person may or may not intentionally be trying to intimidate you with their iron grip. They may even respond positively when you try not to flinch.

7. Lobster Claw

Signature move: The other person’s thumb and fingers touch the palm of your hand, just like a lobster claw.

Personality Type: This person fears connecting at a deep level and may have challenges building relationships. As they become more comfortable with you, their handshake may actually change. You have to earn their trust.

8. Brush Off

Signature move: A quick grasp and release which feels like your hand is being shoved aside.

Personality Type: This person's needs and agendas will always come first,. Pay attention to what he wants before talking about your ideas for them.

9. Controller

Signature move: Feels like your hand is being pulled towards the person, or strongly guided in a different direction.

Personality Type: These people have serious control issues, and want to dominate everything in the room (including you). Any goal that is different from theirs may be seen as a challenge, so expect to do more listening than talking to see if you can find some common ground.

10. Teacup

Signature move: Like a normal handshake, except there's no palm-to-palm contact because the palm is cupped, like a teacup.

Personality Type: This person is either really shy or hiding something from you. Always check for missing information when working with this individual.