Have you seen it in mass edit products popup?
[attachment=13508:tux.png]
Hidden in design/backend/templates/views/products/manage.tpl
{include file="components/easter_egg.tpl"}
its this one
{* easter egg *}{* /easter egg *}<p class="easter__text">{__("easter_coming_soon_message")}</p> <div class="easter__close-button"> <a class="cm-dialog-closer cm-cancel tool-link btn">{__("cancel")}</a> </div>
[attachment=13509:easter.png]