What is the most effective lure or fly to catch fish any day, anywhere?

[hengst]

gold ribbed hares ear nymph

[bigjake]

orginal rapala floater, and a beadhead wolly bugger

[the captain]

Dynamite! Never fails.

[cjqga1]

my favorite is an original brown plastic worm wich works great for mostly bass

[the decoy hunter]

I am assuming that live bait is not in the equation so my personal answer would be the time honored red and white dare devil.Usually the back of this lure is silver in finish and with the white stripe in between the red--- together the entire lure lends different contrasts in all light conditions.So if I could only use one this would be my pick.And if live bait is considered as a lure for the purposes of this question a good old fashioned worm never fails to disappoint.

[flyfisherman101]

What is the most effective lure or fly to catch fish any day, anywhere?