RAM Exhausting using deafult mail client in Internet Explorer, Safari, Konqueror and Firefox.
By again bypassing the "too much recursion" security(if there is any?) in these browsers, it is possible to add iframe elements in a loop. If the src attribute is set to "mailto:", the browser will open the deafult mail client (one for every iframe). This will continue until the RAM is full and the computer will be more or less unusable. This will (of course) require the mailclient to be an external application such as Microsoft Outlook (Which would be deafult in IE and Safari on Windows).
Google Chrome has protection against opening multiple mail clients and Opera has protection against loading of external frame source of "mailto:".
Update:
Tested this in Konqueror 4.3.1(KDE 4.3.1) with SUSE 11.2, and it worked just like in IE or Safari and I was left with numerous of new KMail's (Deafult mail client in Konqueror on SUSE).

I would not recommend you to try this out, thus I was forced to reboot my computer and had to go and make coffee in anger.
Get it here

Sup, I'm Mathias and I was born 1991. It feels like I should really write something here.