First Great Western's crazy email validation for their on-train wifi service.

gistfile1.js

var lastchar = $(this).val().length-1;
var e=$(this).val();
var alpha = /[a-z]/;
if (lastchar<7 || !alpha.test(e) || e.indexOf('@') === -1 || e.indexOf('.') === -1 || e.charAt(0) == "."
|| e.charAt(0) == "@"  || e.charAt(lastchar) == "." || e.charAt(lastchar) == "@" || e.indexOf("a@b.c")>-1
|| e.indexOf("a@bb.c")>-1 || e.indexOf("a@bbb.c")>-1 || e.indexOf("@example.")>-1 || e.indexOf("donald@duck")>-1
|| e.indexOf("mickey@mouse")>-1 || e.indexOf("@crap.")>-1 || e.indexOf("@test.")>-1 || e.indexOf("@none.")>-1
|| e.indexOf("@222.")>-1 || e.indexOf("@2.")>-1 || e.indexOf("no@one.")>-1 || e.indexOf("@off.")>-1
|| e.indexOf("no@email.")>-1 || e.indexOf("no@spam.")>-1 || e.indexOf("fake@")>-1 || e.indexOf("@fake.")>-1) {
    errors = true;
    $(this).parent().addClass('validate-error');
    $(this).parent().prepend('<span class="validation">' + $(this).data('validate-message') + '</span>');
}