I did something mean

The other day I was doing laundry and decided to organize my pantry and laundry room storage cupboard a little bit. I was kneeling on the floor pulling stuff out and the washer started the spin cycle. Lately the spin cycle is really loud and shakes the washing machine pretty vigorously. Patrick came up behind me and asked what was wrong with the washing machine. As a joke I said "Its going to explode you better get out" I didnt say it in a panicked voice, just a calm voice as I kept pulling stuff out of the cupboard. I saw him leave out of the corner of my eye and I grabbed a few more things and then stood up and walked into the kitchen. I heard hysterical crying and I looked over by the stairs of the family room and saw Patrick pushing Elena up the stairs and in his crying hysterical voice he said, "Elena we have to get out! The washing machine is going to explode!!!". The look on his face broke my heart and I quickly told him that I was just joking. There was relief on his face and I hugged him tight. He started laughing and all was well, but I really felt bad. No more practical jokes on 3 year olds I guess.