What I expected to happen was:
It should have kicked me and said "Outdated Server"
What actually happened was:
Game crashed
Steps to Reproduce:
Direct connect to an outdated server
Environment
OS: Windows 8 (ver 6.2, arch amd64)
Java: 1.7.0_11 (by Oracle Corporation)
Launcher: 1.0.8 (bootstrap 4)
Minecraft: 1.6.1 (updated Tue Jul 02 12:27:58 CDT 2013)
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-20163. You can view all information known about this specific crash at MCX-777.