If I expose lots of the sky, I can reproduce this simply by spinning around.
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Display Devices
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Card name: NVIDIA GeForce GTX 260
Chip type: GeForce GTX 260
Device Key: Enum\PCI\VEN_10DE&DEV_05E2&SUBSYS_82911043&REV_A1
Display Memory: 896.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Dell E228WFP
Monitor Max Res: 1680,1050
Driver Name: nv4_disp.dll
Driver Version: 6.14.0011.7741 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 6/18/2008 17:46:00, 6052608 bytes
WHQL Logo'd: Yes
Mini VDD: nv4_mini.sys
Mini VDD Date: 6/18/2008 17:46:00, 6010752 bytes
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fun, Fun, FUN!
LifeTankX Developer --
http://www.reality.net/ac/xx