What are you doing here

*pic from http://www.google.com.hk/images?hl=zh-cn&rlz=1G1GGLQ_ZH-CNHK399&q=芹菜&um=1&ie=UTF-8&source=og&sa=N&tab=wi&biw=1600&bih=737

Place a thousand celery on one table in a large room.

People enter,then eat them.