YES. It is normal. LOL.
I've been through the same thing. One time when I replaced the batteries and turned it back on, my TI-83 told me "I know what you did last summer".
Seeing how I think you are just kidding around, I will address this question to those others who may be reading.
The TI-83 has an alpha-numeric keypad. This is a fancy way of saying that you can type letters onto the screen. If you replace the batteries before the batteries die, the calculator will NOT lose any memory. Therefore, this is just a case of someone typing in a predetermined phrase "I see You". Then turning off the calculator, replacing the batteries, and turning it back on.
PEACE.
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