One of the men (boys really) admitted that they had been taunting the tiger. They had also been smoking pot and drinking.
Logic prevails and the zookeeper wanted to let everyone know:
"Clearly there's the lesson to be learned here," said zoo spokesman Sam Singer. "The lesson is that it's not a good idea to drink, it's not a good idea to be high on dope, and it's not a good idea to taunt a man-eating tiger."
Why would you taunt something that can very quickly look like this: