It is well established that SNe Ia are caused by the thermonuclear explosion of CO white dwarfs. However, there is still a lot of uncertainty about their progenitor channel(s) and explosion mechanism(s). "Bumps" in the early light curves of SN Ia were predicted to occur when the SN ejecta shocks the non-degenerate binary companion (Kasen 2010), thus providing evidence for the single-degenerate (SD) progenitor channel. However, after several examples of these bumps were found, it is still debated if this is indeed evidence for the SD channel, or whether other progenitor channels and explosion mechanism can also cause such bumps.