Do you ever say words backwards? Oftern? Which ones happen most often?

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I have a tendency to say a few words wrong, I say backwards but its more like transposing letters. My mother does it and so did her mother. Is it heredity? It is getting worse as I get older too. Here are some example...these happen all the time instead of parking place--I say sparking place, instead of tray of ice cubes--I say cube of ice trays, instead of dog is wagging his tail--I say tagging his wale Now the newer problem is like this...I saw a duck flying over the house in a circle I said to my bf "look at the duck up there swimming in circle."I hope I am not alone here.