This morning, I woke up and got out of bed just before the first alarm - The digital alarm sounded as usual. The Nokia phone well... silence.
One story that still goes about in the family is what happened when my sister still lived with us about ~15 years ago. My younger brother bought a door bell and wired it up hidden next to her bed. As usual at the time, she slept in on the weekend after a late night out and my brother rang it the following morning. The result wasn't pretty, but it sure woke her up.
One common thing my Dad does on the weekend is leave the kitchen door open while frying the breakfast. This sets off the smoke alarm, both serving as a wake alarm to anyone still asleep and also to test it.