Oprah Winfrey Falls On Stage...VIDEO

Oprah took a tumble during a speaking tour stop ... and then ditched the two things that appeared to be the cause.

The TV juggernaut was at the Forum arena Saturday in L.A. as part of her 2020 Vision speaking tour, and the topic of discussion on the monitor behind her was "Wellness: All things in balance." Welp, it looks like balance worked against her, 'cause she lost hers.