Since everyone seems lots of people seem to fill their JAPHs with non-alpha characters, I thought I would go the other way and write my first JAPH with a-z and ' ' only! 

#! /usr/bin/perl -l

use warnings;
use strict;

s cm cjump s or hide s it eq phcxg cmp s oin ocker oxsio
or s jm pjstjxis ne s k s or k anotk or s s eq ps s lt s
qit qerl qog or s wide s wq qer pqwe eq print and last
for eval q s caller s

[download]

OK its not rocket-science, and I cheated by using -l but it's fun!

updated - thanks to cog for pointing out a JAPH going further and using keywords only! Nice work blokhead. (And I'm sure there are others with a newline and no warnings too.)

update2 - OK it's so obvious how to avoid the -l I feel mildly stupid! At least I worked it out myself (not the method suggested by ambrus either!). Modified JAPH: 

#! /usr/bin/perl

use warnings;
use strict;

s cm cjump s or hide s it eq phcxg cmp s oin ocker
oxsio or s jm pjstjxis ne s k s or k anotk or s seq ps s lt s
qit qerl qog or s wide s wq qer pqwe eq print and last
for eval q s caller s

[download]

In reply to /^[a-z ]*$/ by Roger_B

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