Every once in a while when I'm running my app I get really "REALLY" strange characters in my output instead of the appropriate page. Now I know that this is because of some error, but unfortunately the error doesn't present it's self, but rather just produces strange characters.
Here's an example of a complete page source code.
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I have never seen this with web forms.
EDIT:
So I did some testing today and found some interesting stuff. First of all, the app was throwing a Null Reference Exception (500). Secondly the local debugger saw the error and threw a yellow screen of death right away. The bad text was being shown on the Staging server which currently runs a Release build.
So basically 500 errors on Release builds with customErrors off on my staging server throws CrAzY characters instead of failing gracefully to the yellow screen of death.