I've only seen it happen in Lucky tower to at least five people in every event. Sometimes you'll get stuck in the event and can't use the warps. Other times when someone wins the event, you know how it warps everyone out? If you're lucky you won't be warped and you can still use the warps and wait for the next round of it to start, once it starts you can grab the trophy and win. (I did it once to see if it would work xD)