diff -r cb9342a38ecc src/script/api/ai/ai_controller.hpp.sq
--- a/src/script/api/ai/ai_controller.hpp.sq	Sat Sep 01 19:52:25 2012 +0200
+++ b/src/script/api/ai/ai_controller.hpp.sq	Sun Sep 02 13:04:44 2012 +0200
@@ -20,6 +20,7 @@
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::GetOpsTillSuspend, "GetOpsTillSuspend", 1, ".");
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::SetCommandDelay,   "SetCommandDelay",   2, ".i");
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::Sleep,             "Sleep",             2, ".i");
+	SQAIController.DefSQStaticMethod(engine, &ScriptController::Break,             "Break",             2, ".s");
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::GetSetting,        "GetSetting",        2, ".s");
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::GetVersion,        "GetVersion",        1, ".");
 	SQAIController.DefSQStaticMethod(engine, &ScriptController::Print,             "Print",             3, ".bs");
diff -r cb9342a38ecc src/script/api/game/game_controller.hpp.sq
--- a/src/script/api/game/game_controller.hpp.sq	Sat Sep 01 19:52:25 2012 +0200
+++ b/src/script/api/game/game_controller.hpp.sq	Sun Sep 02 13:04:44 2012 +0200
@@ -20,6 +20,7 @@
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::GetOpsTillSuspend, "GetOpsTillSuspend", 1, ".");
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::SetCommandDelay,   "SetCommandDelay",   2, ".i");
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::Sleep,             "Sleep",             2, ".i");
+	SQGSController.DefSQStaticMethod(engine, &ScriptController::Break,             "Break",             2, ".s");
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::GetSetting,        "GetSetting",        2, ".s");
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::GetVersion,        "GetVersion",        1, ".");
 	SQGSController.DefSQStaticMethod(engine, &ScriptController::Print,             "Print",             3, ".bs");
diff -r cb9342a38ecc src/script/api/script_controller.cpp
--- a/src/script/api/script_controller.cpp	Sat Sep 01 19:52:25 2012 +0200
+++ b/src/script/api/script_controller.cpp	Sun Sep 02 13:04:44 2012 +0200
@@ -15,10 +15,14 @@
 #include "../../rev.h"
 
 #include "script_controller.hpp"
+#include "script_error.hpp"
 #include "../script_fatalerror.hpp"
 #include "../script_info.hpp"
 #include "../script_instance.hpp"
 #include "script_log.hpp"
+#include "../../ai/ai_gui.hpp"
+#include "../../settings_type.h"
+#include "../../network/network.h"
 
 /* static */ void ScriptController::SetCommandDelay(int ticks)
 {
@@ -40,6 +44,26 @@
 	throw Script_Suspend(ticks, NULL);
 }
 
+/* static */ bool ScriptController::Break(const char* message)
+{
+#ifdef ENABLE_NETWORK
+	EnforcePrecondition(false, !_network_server);
+#endif
+	EnforcePrecondition(false, _settings_client.gui.ai_developer_tools);
+
+	ScriptObject::GetActiveInstance()->Pause();
+
+	char log_message[1024];
+	snprintf(log_message, sizeof(log_message), "Break: %s", message);
+	ScriptLog::Log(ScriptLog::LOG_SQ_ERROR, log_message);
+
+	/* Inform script developer that his script have been paused and
+	 * need manual action to continue. */
+	ShowAIDebugWindow(ScriptObject::GetRootCompany());
+
+	return true;
+}
+
 /* static */ void ScriptController::Print(bool error_msg, const char *message)
 {
 	ScriptLog::Log(error_msg ? ScriptLog::LOG_SQ_ERROR : ScriptLog::LOG_SQ_INFO, message);
diff -r cb9342a38ecc src/script/api/script_controller.hpp
--- a/src/script/api/script_controller.hpp	Sat Sep 01 19:52:25 2012 +0200
+++ b/src/script/api/script_controller.hpp	Sun Sep 02 13:04:44 2012 +0200
@@ -105,6 +105,18 @@
 	static void Sleep(int ticks);
 
 	/**
+	 * Break execution of the script when script developer tools are active. For
+	 * other users, nothing will happen when you call this function. To ressume
+	 * the script, you have to click on the continue button in the AI debug
+	 * window. It is not recommended to leave calls to this function in scripts
+	 * that you publish or upload to bananas.
+	 * @param message to print in the AI debug window when the break occurs.
+	 * @pre gui.ai_developer_tools setting is enabled.
+	 * @pre it is not a multiplayer game.
+	 */
+	static bool Break(const char* message);
+
+	/**
 	 * When Squirrel triggers a print, this function is called.
 	 *  Squirrel calls this when 'print' is used, or when the script made an error.
 	 * @param error_msg If true, it is a Squirrel error message.