During our laboratory schedules when the students do their laboratory works, I consume the time answering their programming problem or preparing lectures for the coming days.
However, there are really students who in spite of the problems required to solve, they simply opted for recreations. They simply go online and find online games like the ones they play on their PSP, XBox or gameboy.
I normally call their attention to work first on the laboratory requirements before anything else. But, there are simply instances that when they are done ahead of the others, they find time for fun even for a short period of time.