2000 flushes what?

At the dinner table at my friend's house. Sitting there, enjoying the conversation. Hubs is supposed to be keeping an eye on unleashed Monster (roaming 19-month-old). Hubs comes in, interrupting conversation. "You won't believe what he just did." Turns out Monster was sticking his fingers into the toilet deodorizer (thing that hangs in the toilet and turns the water blue when you flush) and then proceeding to lick the stuff off his fingers. Hubs thinks "poison!" I think "bacteria!" Monster apparently thinks "yum!" because hubs saw him do it twice. And before that? Only the toilet knows.