We lived next to my Grandparents when I was growing up, it made for some good times between my Father and Grand Father.
One time a family of birds made a nest in the eaves of the addition my dad built. The addition contained my parents bedroom and the sound of the baby birds would wake my mother every morning. She insisted my father remove the birds, so he found a good use for them.
Dad caught those babies and put them in a paper lunch bag, took them over to my grandparents house in the evening when grandpa had fallen asleep in his favorite chair and placed the bag on the floor near grandpa. Then dad snuck back outside and watched through the window as the birds began to make noises and escape from the bag. My grand father woke up to the noise and sat there trying to figure out what on earth was going on while dad stood outside the window laughing.
Every year grandpa would plant a garden and my father would plant one to try and compete with his. Each would brag about what they were growing and egg the other on. One year dad had a row of potatoes in, one plant did so much better than the others it was two or three times the size of everything else. It turns out my grand father would wait until dark and sneak over to put fertilizer on that one plant, then come over and mention to my dad how well that one plant was doing and wonder out loud why it was so much bigger than the others. He did this all summer finally telling dad what was going on, they both had a good laugh over that.
There was a truck that grandpa had down by the road and was trying to sell. He also had an old mannequin. He took that mannequin and left the legs hanging out of the hood, boy the cars slowed up and some even stopped to look at that. Not sure how long it took to sell that truck but it did raise some interest in it.