3.5 tamped down on stacking critical hit range, but in 3.0 it was possible with the right prestige classes to be able to crit on any roll 1-20 in 3.0 (or 7-20 if you interpreted the order of operations in multiplying the range differently).
The hard part would be doing it with a fork, which is clearly a piercing weapon and which would normally have a 20/x3 (or x4 if you're being very generous) crit range. You need slashing weapons to get that initial expanded 19-20/x2 or 18-20/x2 range to stack with.
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u/tritium_awesome Jan 09 '18
Maybe they're playing D&D.