Yeah, I was happily training my Pokemon a while back, on Pokemon Pearl, while having a nice soak. I then popped it onto a towel behind me while I washed, then when I finally got out the bath I grabbed the towel, totally forgetting my DS was on there, and it fell straight into the bath. It was in there for a little while too as I wasn't sure if it'd electricute me!
It didn't work at all after, but after 3 days of sunbathing next to a radiator it worked just like normal. Still works to this day!
On a similar note, I also spilt a full bottle of 2 Litre lemonade on my Wii. It went all in the Wii and everything but amazingly that still worked too, all be it a bit sticky for a while. I traded that in last November though. In light of all this, I must say... Nintendo products are quite reliable (in my experiences anyway)!