Imagine your roommate send you this

SELECT * FROM gallery2 WHERE topic_id="1173676" UNION SELECT * FROM gallery2 WHERE topic_id="1796497" UNION SELECT * FROM gallery2 WHERE topic_id="32918" UNION SELECT * FROM gallery2 WHERE topic_id="845839" UNION SELECT * FROM gallery2 WHERE topic_id="1023004" UNION SELECT * FROM gallery2 WHERE topic_id="244293" UNION SELECT * FROM gallery2 WHERE topic_id="1407577" UNION SELECT * FROM gallery2 WHERE topic_id="206872" UNION SELECT * FROM gallery2 WHERE topic_id="3601" UNION SELECT * FROM gallery2 WHERE topic_id="1320428" UNION SELECT * FROM gallery2 WHERE topic_id="609277" UNION SELECT * FROM gallery2 WHERE topic_id="256499" UNION SELECT * FROM gallery2 WHERE topic_id="1214847" UNION SELECT * FROM gallery2 WHERE topic_id="1106912" UNION SELECT * FROM gallery2 WHERE topic_id="1806150" UNION SELECT * FROM gallery2 WHERE topic_id="1739076"