I was perhaps 14 or even 15? and had not been spanked for years.
Due to stupid suggestions from friends I tried to shoplift a record and was caught. My mother managed to get me out of the mess. She seemed furious in the car when driving back.
When we came home, she ordered me to prepare myself for a spanking that I would remember. She came to my room, ordered me to remove pants and briefs, then, when I was dropping them on the floor, ordered me to instead be more orderly and fold them on the chair. I tried doing so while fumbling because I put my hand over my genitals, she got even more cross and remarked that if I wanted to have the dignity and privacy of a grownup then I should act like one, no hand there. When I came back after folding the clothes I again put my hand, only to be met by a roar from my mother who said "what did I say? hands to the sides, it's not like it's the first time I've seen that!!!" or something like that.
She was sitting on my bed and I installed myself across her lap, like I had to do years before, and she started spanking me. She meant business. I mean, usually her spankings were rather soft and more about the embarrassment of having me bare bottom than about pain, but then she was hitting me hard. I guess she also hurt her hand, but she was really furious. She remarked that she regretted not buying a martinet for occasions like these. Not only was it harder than the spankings I remembered, it was also longer.
Finally, she let me go. I remember looking at my bottom in the mirror on the wardrobe, one could see it had been reddened.
The next day, in the evening, as I was going to bed (I think I was going to bed without TV or any "distractions"), she came to my room and ordered me over my stomach. I knew what was next... She sat on my bed, pulled my pajama bottoms down (I was used to the maneuver and recall lifting myself a bit) and spanked me softly while scolding me again about what I had done, how it could have ended much worse, the loss of time and energy for her to take me out of the mess, etc. Then she pulled my pajamas back up, hugged me and wished me good night.