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Time Ram is the name given to what happens if two TARDISes attempt to occupy exactly the same time and space. (DW: The Time Monster)
It can be narrowly avoided by the two TARDISes materialising within each other. (DW: The Time Monster, Logopolis) This happened to the Tenth Doctor and the Fifth Doctor. The Fifth Doctor decribed it said it would cause a black hole strong enough to destroy an entire universe. (DW: Time Crash)