Did it twice, as I recall. Once against Vandy, and then again versus Colorado in the Blockbuster Bowl.
I'll give the man his dues: There will never be another like him. We've heard for 20 years now of prospects who were supposed to be at this level, and I've yet to see one come even reasonably close.
And, really, Palmer was a victim of his era more than anything else, he really came about as a player about 15 or 20 years before he should have. Can you imagine what a kid like that could do in a true spread offense? He could make someone like Percy Harvin look like a practice squad scrub. Heck, even as a 5'8 kid playing outside in Stallings' three-yards-and-a-cloud-of-dust offense with bad QB play, he still racked up 1,000 yards receiving as a junior (and that was when he wasn't playing QB, tailback, kick returner, and punt returner). Put him in Chip Kelly's spread and he's got the Heisman wrapped up by the end of October.