Any time a large object protrudes from the bed of a truck, it's protocol to hang some type of cautionary cloth or ribbon. However, in this ViralHog video, we don't see any kind of red flag per say which is why this motorcyclist probably crashed right into it.
Trees are unpredictable because for us regular folk, we can't tell if a tree is about to fall over. Granted, professionals might be able to but this event just seemed to happen out of nowhere. This Dash Cam Owners Australia video captures the moment a tree in the front yard collapses over top two parked vehicles. What are the chances of getting this on video?!