We study collisions of boosted rotating black holes in $D=6$ and 7 spacetime
dimensions with a non-zero impact parameter. We find that there exists an open
set of initial conditions such that the intermediate state of the collision is
a dumbbell-like horizon which is unstable to a Gregory-Laflamme-type
instability. As is usually the case for similar unstable configurations, the
evolution of such an instability leads to a pinch off of the horizon in finite
asymptotic time, thus forming a naked singularity. Hence, this is the first
fully genuine violation of Weak Cosmic Censorship conjecture in higher
dimensional asymptotically flat spacetimes.
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