Do you want to touch the screen?
msg: "You make a better door than a window"seriously, though: "on their own grounds / in context". But you're right, no pithy phrase comes to mind.OT: I was looking for stuff like this:
"Linux: can't blend margaritas", which is kind of the idea.and I found this fun Google query:
http://www.google.com/search?q=%22worst+*+in+*%22