I should have used a "not possible" last weekend.
DH and I went home for a couple of days. We were at his parents house - his dad was at work and his mom was gone to a birthday party. DH and I were about to leave to go to a pool that closed in a couple of hours.
The phone rings. It's his grandparents. "Y'all going anywhere?," his grandpa asked.
"Yea, we're about to go to the pool," DH said.
Grandpa's response? "Oh, well we better come on down there before you go then!"
We tried to head them off by going outside... we thought - oh, this way they won't come in, they'll just pull up and talk a few minutes. Nope. Didn't work. They came in and stayed nearly an hour! Not to mention the 20 minutes it took them to get there.
After that it was too late to go to the pool.
Why, oh why, didn't we use, "that won't be possible?"