Licking the paint brush thing reminds me of a roomfull of monkeys...
Imagine you have a room full of monkeys. Hang a banana from the ceiling, and put some stairs under it. As soon as a monkey touches the stairs, spray all the monkeys with cold water. Pretty soon, the monkeys will learn not to climb the stairs, and that if any of them does try, they all get sprayed. If any of them try to climb up, the othes will prevent them. At this point you can turn off the water spray, it is no longer needed.
Now take one of the monkeys out, and put a fresh one in. He will see the banana, and try to get it... and to his horror, the other monkeys will pull him down and stop him! Pretty soon he will figure out that if he tries to climb the stairs, he gets attacked.
Now replace another monkey with a fresh one. He will get the same treatment, and the previous newcomer will join in, because thats the rules. Now replace another, and another... until eventually all of the original monkeys are gone. The new monkeys will still prevent anyone from climbing the stairs, even though none of them knows why.