Well, he's clearly a handful as a child. And, I don't think he needs to be in any place named "Imagination Station"- sounds to me like he has all the imagination he needs already!!
But- I hold the day care responsible for this one- think about it- if you were the parent, would you feel comfortable taking your kid back there? He was 5, not 11. Didn't he say he wanted to go to the restroom or something? What if he's been in the restroom passed out or sick- how long would it have been before anyone noticed? Day care workers shouldn't just account for the kid "when they notice", they are supposed to keep up with where they are and what they are doing all day long. JMHO!!
I do agree, though, that this little one can make that job difficult!