When an irate customer stormed  the post office counter, the postal agent responded in his calmest voice, "What's the trouble?"
"I went out this morning," she began, "and when I came home, I found a card saying the mailman tried to deliver a package, but no one was home. I'll have you know, my husband was in all morning! He never heard a thing!"
After apologizing, he got her parcel.
"Oh good!" she exclaimed, "We've been waiting for this for ages!"
"What is it?" he asked.
"My husband's new hearing aid."