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What about (find-if #'identity my-list)? That seems to work.
Anything better?
For an obfuscation contest, I think (find-if #'null my-list :key
#'not) would do well :) Otherwise, the function "some" is often
used here. I like to define "true" as an alias for the "identity"
function for such uses.
Also, loop is often useful:
(loop for x in my-list thereis x)