Bank Tellers Tips..please!

If I am in a queue at the bank, I usually watch the tellers and try to assess which will be most friendly. Listen to how they are interacting with other customers. If I "draw" a less preferable teller, I will often fumble around and make up some excuse the let the person behind me "cut" so I can get the best teller. Also, I try to determine who is the head/commercial teller, if possible, since that person will probably know from memory what (e.g. half dollar rolls) is in the vault, and have the quickest access to the vault. Often the head teller is on the end and, in banks where tellers are behind glass, has a "pass through" window rather than the "slide through" slots.