SIGNATURES....Can they define a person????

Sometimes i think about that matter,because as a Teacher,i'm always see that the signature pattern shows the personality of person. 1.The signature with the pen effect too deep mean the person is a hardworking people,sometimes mean that the person is in problem 2.The signature with the sign pattern so beautiful mean that the person is a very careful person,an intelligent person,creative persons and also sometimes mean that the person is successful in they life! 3.The signature with the pen effect is not so clear mean that the person is not a confident person,low self esteem and also the lazy person,but sometimes mean that the person is a very unpredictable person! That what the signature mean for me as the teacher..there are many more...but just can list 3!