Use Liam Neeson's badass quote from "Taken" to scare someone into returning your phone

Send IFTTT an email tagged

Send IFTTT an email at trigger@applet.ifttt.com with a hashtag in the subject (e.g. #IFTTT) and this Trigger fires. You can optionally add a single file attachment (up to 30MB) and IFTTT will create a public URL to the file as an Ingredient.