@billgoats i have another one. In #soaring (flying planes without engines) we long used #ipaq s for navigation (screen sunlight readable), attached to the windshields. One pilot came to me and told me that his IPAQ would stall when the course of the plane was between 270 and 300 degrees. Somewhat perplexed I went looking and found out that the IRDA port in IPAQs had a bug, that would cause 100% cpu if the sun shone into the IRDA port. Firmware update fixed that.