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why do I keep forgetting which pedal has the opposite screw?
Possibly because you're trying to remember it as a table with two columns and one row (or one column and two rows), rather than as a picture. @TM 's method works as long as you have the your hand above the pedal spindle. The other way is to remember that if the pedal bearing seizes, the pedal will unscrew. This also works for English BB threads - if the axle and the cup are locked together, the normal rotation of the axle will unscrew the cup from the shell.
Been wondering how many gigabytes of memory our bains have... Google says 100,000 terabytes. Seems quite a lot. so why do I keep forgetting which pedal has the opposite screw?