Reading this topic, another question comes to mind:
How do you handle it if you give, say, an I critical (probably from a lightning bolt) to a large or super-large creature? Would it be a single crit (it _is_ one crit of "at least B/D severity", or 2/3 crits for large/superlarge, since I = E + D + B?
Oh, and I keep forgetting what a J crit is - it's a possible resuilt, but not explained in the table. Is it E+E+C?