If you find yourself–like me–in the situation that your Mac has crashed and you want to retrieve the crash reports (some call them logs 😉 )? Well, there are basically two ways.
You can look them up with the “Console” tool (find it in /Applications/Utilities/Console or with Spotlight). Open the “System Diagnostic Reports” section on the left and find an entry similar to Kernel_<date>_<your_pc_name>.panic at the top.
You can also find these reports as text files under /Library/Logs/DiagnosticReports with the same names. OS X will open them with the Console tool per default.