1). Suit and tie. Always beter to overdress than underdress.
2). Be totally relaxed, confident (not overconfident), and smile as often as necessary.
3). Always make direct eye contact.
4). Be as honest as possible.
5). Make sure you don't stink when you go for the interview (that would hurt your chances of getting the internship).
6). Carry along an extra copy of your resume (I assume you will already have one to present if you haven't already presented one).
7). Ask sensible/relevant questions concerning your intended position and do a little research b4 hand about the company you intend to work for.
8). Don't joke around too much.
9). If you don't know the answer to a question, just say, "I DON'T KNOW." Don't try to BS your way to the answer.
There's my advice. I'm sure I forgot something. Well, take what you need and throw away all the other stuff that remains.
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'79 Mustang Coup
4" Cowl
Weld wheels (15x6;15x8)
Stock 5.8L
C4 w/ shift kit
1.5" MAC full length headers
Holley 750 CFM
Edelbrock intake
2.5" Off road H-pipe, 2-chamber Flowmasters
8.8" Rear end w/ 3.55 gears (Now that's more like it!!)

Front: 225/60/15 Rear: 255/60/15 Eagle GT II
14 x 4” K&N air filter (getting the Xtreme setup soon)
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body