Possibly #1 spark plug was shorting out or has a smaller gap than the others.
Alternately the other cylinders could be experiencing high resistance due to corrosion, larger plug gap, mismatched plugs etc.
Add some moisture to the equation and a spark can jump further than you think.
Like wi11y said under the right conditions when dark you can see quite the light show.
I have seen the spark on a GM Vortec 5.7 exit the boot at the cap, travel the length of the wire externally and enter the boot at the plug end.
Run it when it is dark outside and spray water on the wires with a spray bottle, if things are degraded you will either see it or hear a snapping or hear stumbling as the spark changes direction.
Moisture in the rotor can also lead you on a wild goose chase.
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