If you failed to do a trick of your own, the kid was perfectly justified in thinking something up on his or her own. Note that toilet paper, shaving cream, and rotten eggs are for pikers. Fortunately, we've come a long way since then. However, remember that there is a precedent for that razor in your candied apple. It's a gift from a reincarnated Celt.
Witches are too busy partying to do anything like that.
In fact, we'll party all night long at the slightest provocation. On Samhain our excuse is that midnight is the most magical of the hours. And once one is up that late, one may as well continue. There's a certain somberness about this particular occasion, but we take it in stride. We'll wear costumes, so long as they are black.