It's actually relevant here. For people less familiar with some aspects of Unicode, this is a neat example, along the same lines as the OP. Just don't try to select it!

When you say "don't try", some people take it as a personal challenge :) Why does this happen? How can it mess up my selection like this?

Mess up in what sense? Selection seems to work reasonably on that text for me in Firefox....

It's displayed with boxes here, not the actual zalgo text (although I can paste it somewhere and looks correctly there), although my encoding is set to UTF and I can't select single boxes. The whole page kept blinking, but this was another issue (the layout of the comments, when I went over some borders it kept selecting and deselecting the whole page which caused it to blink).

Huh. Is that in Firefox? On what OS?

Chrome on Windows 7 with U.S. English regional settings... As boring a setup as it gets!

Sounds like a possible WebKit bug, then, to be honest...

Same here. Displays and able to select it quite alright. (Ubuntu 12.10, Firefox 21)

Although searching for the same text results in Google telling me this:

  414. That's an error.

  The requested URL /... is too large to process. That’s all we know.

"Just don't try to select it!"

Why - seems to select perfectly well when I try it using Firefox on Windows 7.