  We show that a large mixing between the right-handed charm and top squarks
(i) is allowed by low-energy flavour constraints; (ii) reduces the experimental
bound on the stop mass; (iii) has a mild, but beneficial, effect on
fine-tuning; (iv) leads to interesting signatures at the LHC not presently
investigated by experiments. We estimate the current bound on the stop mass, in
presence of flavour mixing, and discuss the new collider signatures. The signal
in the t anti-c (c anti-t) + missing E_T channel is large enough that it can be
immediately searched for experimentally, while the signature with same-sign
tops and missing E_T requires a luminosity upgrade of the LHC.
