diff --git a/core/hostevents_sdl.cpp b/core/hostevents_sdl.cpp
index 27daa94..6c92b35 100644
--- a/core/hostevents_sdl.cpp
+++ b/core/hostevents_sdl.cpp
@@ -29,6 +29,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 EventManager* EventManager::event_manager;
 
 static int get_sdl_event_key_code(const SDL_KeyboardEvent &event);
+static void toggle_mouse_grab(const SDL_KeyboardEvent &event);
 
 void EventManager::poll_events()
 {
@@ -53,6 +54,14 @@ void EventManager::poll_events()
 
         case SDL_KEYDOWN:
         case SDL_KEYUP: {
+                // Internal shortcuts to trigger mouse grab, intentionally not
+                // sent to the host.
+                if (event.key.keysym.sym == SDLK_g && SDL_GetModState() == KMOD_LCTRL) {
+                    if (event.type == SDL_KEYUP) {
+                        toggle_mouse_grab(event.key);
+                    }
+                    return;
+                }
                 int key_code = get_sdl_event_key_code(event.key);
                 if (key_code != -1) {
                     KeyboardEvent ke;
@@ -278,3 +287,25 @@ static int get_sdl_event_key_code(const SDL_KeyboardEvent &event)
     }
     return -1;
 }
+
+static void toggle_mouse_grab(const SDL_KeyboardEvent &event) {
+    SDL_Window *window = SDL_GetWindowFromID(event.windowID);
+    if (SDL_GetRelativeMouseMode()) {
+        SDL_SetRelativeMouseMode(SDL_FALSE);
+        SDL_SetWindowTitle(window, "DingusPPC Display");
+    } else {
+        // If the mouse is initially outside the window, move it to the middle,
+        // so that clicks are handled by the window (instead making it lose
+        // focus, at least with macOS hosts).
+        int mouse_x, mouse_y, window_x, window_y, window_width, window_height;
+        SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
+        SDL_GetWindowPosition(window, &window_x, &window_y);
+        SDL_GetWindowSize(window, &window_width, &window_height);
+        if (mouse_x < window_x || mouse_x >= window_x + window_width ||
+                mouse_y < window_y || mouse_y >= window_y + window_height) {
+            SDL_WarpMouseInWindow(window, window_width / 2, window_height / 2);
+        }
+        SDL_SetRelativeMouseMode(SDL_TRUE);
+        SDL_SetWindowTitle(window, "DingusPPC Display (Mouse Grabbed)");
+    }
+}