My wife sent me the first one (I had to censor one word to make it user-friendly). After all, we have do something about these damn people who can't walk and chew gum at the same time, yet they're chatting away on the phone behind the wheel and think it's nothing, while screwing up five states of traffic on one roadway.
Now, before one starts accusing my wife, the person who made the sign, the person sending the sign to my wife, or myself of using Jesus' name in vain, the actual implication I see here is If you love Christ, hang up your phone!
Now, here's one for the church door:
This should drill some common sense, eh?