  We present photometric and spectroscopic data of the peculiar SN 2005la, an
object which shows an optical light curve with some luminosity fluctuations and
spectra with comparably strong narrow hydrogen and helium lines, probably of
circumstellar nature. The increasing full-width-half-maximum velocity of these
lines is indicative of an acceleration of the circumstellar material. SN 2005la
exhibits hybrid properties, sharing some similarities with both type IIn
supernovae and 2006jc-like (type Ibn) events. We propose that the progenitor of
SN 2005la was a very young Wolf-Rayet (WN-type) star which experimented mass
ejection episodes shortly before core collapse.
