I like how *.c RET has exactly the same efefct from within dired as it does at the C-x d prompt, even though it's for different reasons (filename globbing vs dired-mark-extension). I never really use C-x d to invoke dired, so I hadn't noticed this nice piece of consistency before.
Family and friends are coming together online to create a special keepsake. Every memory left on the online obituary will be automatically included in this book.