Client: We want a contact form on our site that accepts files.
Me: OK. Here are the backend options (custom built, WordPress, third-party service, etc).
C: Mmm... why is it so complicated? A simple form doesn't need a backend.
Me: FFUUUUU Y DONT YOU DO IT THEN! DIDN'T KNOW BROWSERS SEND EMAIL?!
Me: *backspace*, *backspace*, *backspace*
Me: Browsers cannot send emails; you need a backend to process the form.