In all seriousness though, most automotive remotes of decent quality have a seal in them to help make them water-resistant (ie. splashes, rain, etc) but due to the design, they can usually take a more than that. Considering the things keys can go though, having a seal is just common sense really. Even the standard Toyota remotes can take the occasional dunking:
On a side note, for really low power electronics like that, even if the insides did get wet and it stopped responding, all you would need to do is dry it out and you would be able to get it to work again (providing the battery is still okay). Electronics on a scale like this are pretty hardy these days. I've put USB drives through the washing machine and dryer numerous times and they still work.