My Partner Is Not So Smart (Phone)

(I have just gotten a new cellphone, and am entering numbers into it.)

Girlfriend: “You should put your number in there, in case you lose it!”

Me: “Good idea!” *I start to add a new number, then stop.* “Wait… how would that help me?”

Girlfriend: “Well, if you left your phone here, I could call you!”

Me: “But if I put the number into my phone… and you have my phone… how will you call me?”

Girlfriend: “By calling your number!”

Me: “But if you’re calling my phone, and you HAVE MY PHONE…”

(We went back and forth a couple more times before she realized that putting my cell number in my cell wouldn’t be as useful as she first thought.)