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Recent VHE observations have unveiled a surprising behaviour in twowell-known blazars at opposite sides of the blazar sequence. PKS 2155-304 haveshown for the first time in an HBL a large Compton dominance, high gamma-rayluminosities and a cubic relation between X-ray and VHE fluxes. 3C 279 is thefirst FSRQ detected at VHE. The high luminosity required to overcome thesignificant absorption caused by the BLR emission cannot be easily reconciledwith the historical and quasi-simultaneous SED properties. Both cases shed anew light on the structure and ambient fields of blazars. Contrary to previousclaims, it is also shown that 3C 279 --as any FSRQ-- cannot in general providerobust constraints on the EBL.

The new surprising behaviour of the two "prototype" blazars PKS 2155-304 and 3C 279