From here and here:

A 10-year-old elementary school student inserted 1,000 KRW into a crane game, but when he failed to get the merchandise he wanted he climbed in through the hole to get it himself.

Unfortunately for him, however, he wasn’t able to get out with similar ease. Luckily the fire department showed up and got him out 20 minutes later.

Apparently the secret to winning crane games was hiring an elementary school student to climb inside and give me all of the goods. I only wish there was video.