This little event really surprised me when it happened at WMR. During one of the matches the human player for someone on our alliance(not sure what team, and that doesn't really matter)tossed out a Spoiler and it did something interesting that we got a video off. The spoiler you are about to see came from the Blue alliance.
http://youtube.com/watch?v=Os8sWO0Itqo
I only recall seeing a thrown spoiler making it on in one other match I saw(though half my time is spent with my team at the practice field) any other times you've seen a spoiler, or any other tube for that matter, make some sort of surprise landing?