Experience!

Ok, anyone who has seen Peter Kay perform will probably know this joke.  His Mum used to tell him to give her 3 rings before bed to tell her he was safe. Well, I actually heard of someone doing this today :) 

Standing at the clocktower, a little old dear (bless) was on her mobile talking to her daughter i presume telling her to "give me 3 rings before bed to let me know your safe my love " HaHa. Love it!