I am amused. :)
More seriously, Strominger talked about dS/CFT as analytically continuing AdS/CFT. This is not normally kosher, but in if your bulk theory is higher spin you don't run into the problems you do when your bulk is say type IIB. So with that you end up getting 3d CFT's that have SO(-N) symmetry.
What the fuck does that even mean? Novikov asked the same question in 1980. It means Sp(N). Why? Because the change in the quadratic forms transforms the scalars from commuting to anticommuting. That means that the loops get factors of -N instead of N.
But that is the liar's (read physicist's) explanation. Maybe you should just call me a liar.
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