Went out for a leisurely 2 hour spin and got hammered in a downpour for about 40 minutes. Sheets of rain, big and deep puddles. I was mildly concerned about the possibility of a driver hitting me because of the poor visibility, but I was even more concerned that they'd hit a deep puddle and that the wave would knock me off of the bike and/or road. Made it home without issue, thankfully.
My nice, new Zipps, on the other hand, are sloshing something fierce. I'll have to see if there's a drain hole, otherwise I'll have to at least unseat the tire and remove the valve stem, I think.