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Since 2007, the blazar 3C 454.3 has become the most active and the brightestgamma-ray source of the sky, deserving the nickname of "Crazy Diamond". Theshort-term variability in the gamma-ray energy band and the extremely high peakfluxes reached during intense flaring episodes make 3C 454.3 one of the besttargets to investigate the blazar jet properties. We review almost four yearsof observational properties of this remarkable source, discussing both short-and long-term multi-wavelength campaigns, with particular emphasis on therecent flaring episode which occurred on 2010 November 20, when 3C 454.3reached on a daily time-scale a gamma-ray flux (E>100 MeV) higher than 6.5E-5ph/cm2/s, about six times the flux of the brightest gamma-ray steady source,the Vela Pulsar.

A success story: 3C 454.3 in the gamma-ray energy band