Synthetic optical spectra of the 20 M_⊙ (black) and 25 M_⊙ (blue) rotating models at the pre-SN stage. The flux has been continuum-normalized and offset for clarity. The strongest spectral features are identified. We also show the observed spectrum of the prototypical LBV AG Carinae obtained in 2002 July 04 (green), when the star had an effective temperature of 16 400 K (Groh et al. 2009b). Note that AG Car has a higher luminosity than the pre-SN models, and is shown only to illustrate the morphology of a typical LBV spectrum. We note the remarkable similarity between our synthetic spectra and a typical LBV spectrum. This suggests that some LBV stars are caught just before the explosion.