I was inspired by ascii-art-math to generate my favorite math equation:

#!/usr/bin/perl
use warnings;
use strict;

print<<END_OF_VIAGRA;
  /
 |  x       n
 | e  = f(u)
 |
/
END_OF_VIAGRA
[download]

Or as a 1 liner:

perl -e 'print "  /\n |  x       n\n | e  = f(u)\n |\n/\n"'
[download]