i don't think i've done any unless one of the streetfighter or mk figures were like that. i would boil a bowl of water in the microwave , put him in it on the counter for a few . fish him out while still too hot to hold, lay him face down, put a strong exacto blade on the seem on back of his leg, and tap it with something firm.
might pop open clean, might shatter into pieces. all depends on the type of plastic and how it's aged. proceed at your own risk

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The more you run over a dead cat,
the flatter it gets.
-Anonymous