1. Create small partition, 100mb seems enough
2. Create new project in that partition and select all "Asset Packages" you can
3. Import will start and crash mid-way due to running out of space
4. You will be prompted with "Writing asset file failed" dialog window w/ "Try Again" and "Force Quit" buttons. "Try again" does nothing (as expected) and "Force Quit" only creates bug report window and reopens said dialog window ad infinitum.
5. Notice that you can't seem to quit by conventional methods. Expected behaviour - quiting by pressing "Force Quit" once

Notes:
http://screencast.com/t/2P4qZlejs - what it looks like.

Seems to

Reproducible in:
Windows 10 w/ 5.0.3f2, 5.1.4f1, 5.2.1p3, 5.2.2p1
Win7

Not reproducible in:
Win10 w/ 5.3.0b4 (quits after pressing "Force Quit" once)
Win8.1