One failed motherboard or smth like that, one because of display issues + keyboard, 2 because of keyboard become unusable. All MacBook Pros. A couple could not be serviced (>2 years old), one could not be fixed, one I changed job (to be fair, I don't know what happened with that one, they may have fixed it).
In comparison, the cheapest laptop I have ever owned (EEEPC) lasted more than 10 years.