I've tried to dailup without even remembering to actually plug the modem cable into the laptop.
The other one I did a couple times when I was in college was fireup firefox on my laptop and wander why I couldn't open any pages.
Might have had something to do with having left the wi-fi card at home and the fact the college didn't have a wireless network anyway (bearing in mind then 802.11b cards were £70+) i think the wi-fi card was worth more than my laptop at the time.