I hadsta break
out the landline!
"Now Guy Eymin Petot Tourtollet, 46, scientific director of the French pulp and paper research institute Centre Technique du Papier, has invented a snowflake-patterned [ha!] wallpaper that blocks Wi-Fi signals, while still allowing FM radio and emergency frequencies to pass through."
Click this and/or this.
And for all of those commenters ready to chime in with, "well if your classes were more interesting, then your students wouldn't be on Facebook" please note that the product is being pitched to movie theaters.
If the focused efforts of the entertainment industry can't keep people off their cell phones, I'm not too optimistic about my chances.