We are identical!

The other day I was at my sister's house when my husband called asking me to either pick up a few groceries or takeout on my way home. As I was leaving my sister's I called my husband on my cell to discuss our dinner options. I got the machine and proceeded to leave a rather whiny message 'it's me, are you there... I'm leaving my sister's, pick up the phone if you're there, hello, are you there, pleeeeeasssse pick up the phone, helllllllooooo?" He didn't answer, turns out he'd fallen asleep on the couch. Later that night as I'm putting my little miss to bed, I hear my answering machine and what I thought was my identical twin sister leaving me a message saying, are you there, pick up if you're there, hello... her voice sounded very panicked and I rushed down stairs with half asleep baby in tow to see my husband standing over the machine, just looking at it. We always screen our calls. "Pick it up" I yell, gees, can't he hear the desparation in her voice, there must be something terribly wrong. He turns and looks at me and says in the same tone I'd presented him with- "it's you, stupid." He was only now listening to the message I'd left earlier in the day. But it sounded so much like her... And we needed a DNA test to prove our zygosity!!