Hip-hop artist LL Cool J has performed and recorded with a lot of talented people, but working with Michael Jackson ranks as "the most amazing" experience, he shared on 'Lopez Tonight' (weeknights, 11PM ET on TBS).

The two artists did "quite a few songs" together, but they were never released. One evening in the studio, sitting at a baby grand piano, LL asked MJ, "In the 'Smooth Criminal' -- how'd you lean forward like that?"

MJ, sitting cross-legged atop the piano, replied: "We had a Swami come in ... He did a ritual and he leaned forward, and we all leaned forward together." LL told George Lopez, "I was like, 'Really?' He was like, 'No, silly!'"

The 'NCIS: Los Angeles' star then divulged a story he'd never told before -- about farting in front of the King of Pop.