Haha, don't worry about it. =P I've done it before, too.
I'm almost 100% certain that I want to do the internship... but I need to talk to my supervisor, because I want to "negotiate" as far as the hours are concerned. xD Normally, you commit for two quarters, and come in to the lab for 10-12 hours/week. BUT, I've already done all those hours WITHOUT CREDIT (that was my choice, and yes, I had a good reason for doing so)... so I want to see if I can get away with half of those hours, but still get full credit, given all the work I've done so far. =P
It's so confusing, and I also need to ask him for a letter of recommendation for graduate schools... so that's why I'm taking my time in figuring out how to approach the subject(s). D=