I've seen someone who desperately wanted their nobel laureate PI on their paper but the professor did not put his name on the paper because it was all their ide

I've seen someone who desperately wanted their nobel laureate PI on their paper but the professor did not put his name on the paper because it was all their idea (even though it was his grant, he reviewed and ok'd the paper, paper was relevant to his lab, and he really spoke effusively at their thesis defense)