I voted Synodontis, and it wasn't even close for me... I've had, at some point: S. angelicus, S. decorus, S. petricola, S. multipunctatus, S. nigriventris, S. eupterus, S. nigrita (or one of the species of "lace" cats), S. serpentis, and S. ocellifer. I'm currently resisting the urge to add S...