Lucas started grabbing at his cup and bringing it to his mouth sometime last fall. Here's a clip from October 2009:
He wasn't doing it consistently back then, but today it's a different story. Today, Lucas only drinks from his cup if he's holding it, and just last week he started picking up the cup himself from his table tray. I just got a new camcorder (Canon M30, which is all digital and is way nicer than having to deal with video tape), and I was able to catch Lucas picking up his cup last night (it happens very quickly at the beginning of the video):
And - here's a clip from the other night when Lucas was hopped up on sugar after eating a donut for dessert:
