Among them was ABC7's own Ben Bradley. He and others got harnessed for the third annual Skyline Plunge down the Wit Hotel at State and Lake streets.
The Plunge raises more than $160,000 for the Respiratory Health Association.
You can watch plungers Saturday from 10 a.m. to 4 p.m. and Sunday from 9 a.m. to 5 p.m.
For more information, log on to lungchicago.org.