How about the multiple interrelated stacks that make up web app development? That's what's really scary. You've at least got a server OS with its own kernel,

How about the multiple interrelated stacks that make up web app development? That's what's really scary. You've at least got a server OS with its own kernel, runtimes, HTTP server, database server, application server, web framework, HTTP, SQL, SSL, HMTL, CSS, JavaScript, the browser itself, jQuery or other client-side frameworks, web services, etc. etc. etc. ... It's madness!