File this under "Holy sh*t!" Ice climbers Mike Horn and Fred Roux were attempting to climb an iceberg when the massive block of ice rolled over in their direction. As the block starts moving, both men start climbing fast, as though on an ice treadmill, but they are unable to keep up with the ice and ditch into the water. Luckily, both escaped without injury. Horn had a sense of humor about the event, writing "Oops, should not have eaten breakfast before climbing."
You can watch a longer video about the incident below. Note that it is in French, but Youtube will provide mediocre translation using the closed caption feature.