Handle interrupts more gracefully on the warning message

bin/vagrant

@@ -43,8 +43,16 @@ begin
                "\n" +
                "This message will be removed when this version is officially released.",
                :prefix => false)
+  result = nil
+  begin
     result = env.ui.ask("If you're sure you'd like to continue, type 'Y' and then enter: ")
-  exit 0 if result && result.upcase != "Y"
+  rescue Interrupt
+    result = nil
+  rescue Vagrant::Errors::UIExpectsTTY
+    result = nil
+  end
+
+  exit 0 if !result || result.upcase != "Y"
 
   # Load the environment
   logger.debug("Loading environment")

plugins/commands/destroy/command.rb

@@ -29,6 +29,7 @@ module VagrantPlugins
               do_destroy = true
             else
               choice = nil
+
               begin
                 choice = @env.ui.ask(I18n.t("vagrant.commands.destroy.confirmation",
                                             :name => vm.name))
@@ -41,6 +42,7 @@ module VagrantPlugins
                 # means the same thing.
                 raise Vagrant::Errors::DestroyRequiresForce
               end
+
               do_destroy = choice.upcase == "Y"
             end