Depends. My old WinBook3 had this stupid metal plate on the bottom. If the laptop was plugged in for a long period of time, that sucker would get too hot to touch. If I kept my hand on that plate for an extended period of time, I could see that it might give me blisters.
Heh, now she can tell everyone the story about how she got that laptop-shaped scare on her belly!
Laptops are dangerous, though, but most ly only when they're not being used. Aside from spermacide and ruining good work slaks, I've known them to cause "interesting" problems. I had one friend who put his laptop on the passenger seat of his car. While in fast traffic on i495, the laptop slid off the seat. He dove to catch it, inadvertantly yanking the steering wheel, which sent him into a guard-rail at 55mph.
While in college, a close friend of mine was standing on the corner of an intersection, waiting to cross to go to her next class. Some kid decided to play traffic Frogger and started out into traffic. On the way across, he apparently dropped his laptop on the street. Someone swirved to avoid it, which caused another driver to freak out and swirve, ramming up over the curb and hitting my friend.
Laptops are a menace to society! Their owners shouldn't be allowed to stop working on them! Every time they stop and put it down, bad things happen!