diff --git a/.emacs.d/init.el b/.emacs.d/init.el
index 75ffa59..a005fec 100644
--- a/.emacs.d/init.el
+++ b/.emacs.d/init.el
@@ -129,6 +129,17 @@
                (file-writable-p buffer-file-name))
     (find-alternate-file (concat "/sudo:root@localhost:" buffer-file-name))))
 
+(defun eval-and-replace ()
+  "Replace the preceding sexp with its value."
+  (interactive)
+  (backward-kill-sexp)
+  (condition-case nil
+      (prin1 (eval (read (current-kill 0)))
+             (current-buffer))
+    (error (message "Invalid expression")
+           (insert (current-kill 0)))))
+(global-set-key (kbd "C-)") 'eval-and-replace)
+
 (custom-set-variables
  ;; custom-set-variables was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.