Hire A Techie
Rescue me now!..... - This site is a really good idea, it basically sends you a text when you need to get out of a sitution. It is mainly aimed at the dating market, however you can use it for most situations. You sign up which is free, and you get 1 free credit to try out the service, you specify the day, time, and what you want it to say, then at said time on said day you get the text!
They also mention on the facebook group that people have used the service to play practical jokes on people! I think this side of the site has massive potential! They are also adding a feature soon which allows the user to request an email to be sent to their friend should they not log back into the site after their date, thus preventing potential abuse etc. Take a look at the site for yourself and see what you think!