glue........
(almost put tape-- and remembered that a friend's 5-year-old stepson found some gorilla tape at like 2am and tried to put it on his face- over his eyes-- like a mask)
(The kid started screaming and woke up everyone in the house and then his stepfather had to figure out how to get the tape off. Kid ended up with a very swollen face and eyes and the mother sent a note to school the next day explaining what happened to his face-- I can just imagine the reaction of the teachers reading a note that the kid put gorilla tape on his face-- the kid also likes to chew on deflated balloons and has choked on them and had to be saved by his stepfather at least 3 times. Let's just say he's not the brightest bulb in the world; but neither is his mother).