I did not want to respond to this question at first. I guess I didn't want everyone to know how stupid I am, but I that's probably been public knowledge for a long time, so what the heck. There's most likely been more stuff in my tank that I shouldn't have purchased than what I've been happy with. In my younger days, I really enjoyed trying different genetic combinations, so that was probably part of the problem. Bulls I wish I had never purchased: Ayatollah (fortunately, I never used any of it and that tank went dry) War Horse (I know he worked for some, but not for me), Lights Out, Barrington Hardy and Bar-D Belle's Winner (back in the old dual purpose days), Ace of Spades (an old Black Chi bull. Dad used him on some cows and were those calves nuts), and somebody will probably think I'm nuts but I'm going to include Heat Seeker as one I wished I'd have never used. The two calves I had out of him were plumb loco. I bought a purebred Maine cow bred to Red Hot, I think a Heat Seeker son, and that calf was crazy, too. Truth be known, I think we'd all be better off if a bull had a track record before we tried him.