Hmmm, that would mean if there's a bit of cold coffee from yesterday, you're stuck - you aren't getting fresh coffee.

    $mug =~ s/.*/coffee/s, sleep(1500 + rand 600) while 1;
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Or maybe:

    $mug =~ s/.*/beer/s, sleep(1500 + rand 600) while 1;
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Perl --((8:>*

I guess I don't like stale coffee in my mug.

foreach (@days) {
    my $mug = 'coffee';
# rest of the day
}
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would be a more desirable description. ;-)

$mug->consume
   while $mug->is_not_empty;
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And more importantly:

$mug->refill( $name_your_poison )
    if $mug->is_empty;
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and, derivatively from this thread:

#!C:/perl/bin

system ("cls");
print "\n";
$COFFEE = "COFFEE"; $mug = "mug";

print "\n\t $mug->refill( $COFFEE )\n\t   if $mug->is_empty;\n\n";

print "\n___________________ small cup\n\n\t\t";

$_='c[_]';
s/\Qc[_]\E/c[~]/;
print $_,$/;

print "\n\t\t    -jbWare\n";
print "\n    ++++++++++++++++++++ medium cup\n\n";
     
$cup1 = "\t       /|~~~~~~|\n\t      ( | use  |\n\t       \\| warn;|\n
+\t        |      |\n\t         \\____/    \n ";

print "$cup1 \n";


print "\t\t\t -ww\n";
print "\n\t====================== large cup\n\n";

print "\t";$a = ".";for ($i=0; $i<20;$i++){print "$a";
}print"\n\t|\t\t   |\n\t|  use strict;\t   |......\n\t|  use warn;    
+   |\t  |\n\t|\t\t   |\t  |\n\t|\t\t   |\t  |\n";
print "\t|\t\t   |......\n\t|\t\t   |\t\n\t|\t\t   |\t\n\t|\t\t   |\t\
+n\t";for ($i=0; $i<20;$i++) {
print "$a";
}

print "\n\t\t\t -softworkz\n";
print "\n\t  __________________________ timeless wisdom\n";

print "\n\t\tuse Perl;\n\t\tIt is Perlish, simple and elegant.\n\t\t -
+John Krahn\n\n";
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oops! ... no "use strict;
             use warnings;" in code.
add:    "require caffeine;"
(;<}

If only

s/empty/coffee/mug;
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was valid syntax.

I just stumbled upon this, 8 years after it was written. Now the syntax is valid:

$ perl -Mstrict -Mwarnings -E '$_ = "empty"; s/empty/coffee/mug; say'
coffee
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[In fact, as far as I can tell, it has been valid since 5.14]