Wrong number

When my husband and I were in town shopping , we ran into some friends who invited our whole family to have dinner with them that evening. I said I'd check with the others and call to confirm plans. Later I phoned to say there would be five of us coming for dinner at six o'clock. There was an ominous silence at the other end of the line.
"Have I got the wrong number?" I asked .

"I sure hope so." came the reply.