A Garcia y Vega entubo that I bought for $3.50 at a tackle-shop near June Lake. It burned hot, tasted harsh, and after three puffs, burned open a hole in the side at about an inch and a half from the top, where the smoke seeped out.
Worst "real" cigars: Blue Label B2 bundle smokes (wouldn't stay lit but tasted so bad I stopped trying to relight it after it went out twice); and Graycliff Professionale, which is the only cigar I've had that was so foul tasting I had to cut it open after a few puffs, just to see if there was some real horse**** blended in.
Does stopping after only a few puffs really count as "smoked"?