Trying to put things in contexts: HttpContext, Call Context, Execution Context, Thread Context...
How would you troubleshoot potential deadlocks in Sql Server Compact 4.0?
When deep-debugging forces you to reconsider everything you knew about AppDomain isolation, threads, and culture.
Symptom: your ASP.NET application restarts periodically, supposedly because of "IIS configuration change" - problem is, nothing changed. And nobody seems to figure out what is happening.
Debugging a weird custom IIdentity serialization issue.