You're innocently trying to illustrate a massive traffic jam that's built up live on TV when, in your intense concentration to get it just right, you fail to see that you're actually drawing a massive cock, right there on the touchscreen monitor. Ooops.
Apparently she was trying to warn people in Michigan of a roadblock in the centre of town. In the end, she gave everyone a laugh, and didn't even seem to notice, or if she did, just ignored it. Because Siobhan Riley is a consummate professional, obviously. [YouTube via BuzzFeed]