While I m driving around 50KM/H or 31MP/H my child switch my gear from D to P?

What will happen to my car? Just tried happen once, will it cause serious effect?

I m driving Honda Civic 2010 model.
Added (1). Correction**

What will happen to my car? It just happened once, will it cause serious effect?

I m driving Honda Civic 2010 model.

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