Odd thing at young age??

My 5 year old will randomly hump pillows. I guess now stuff animals too. I take them away but still does it at times. Anyone else experience this and how normal is it? It bugs me so much, just no idea how to get her to stop or at least do it in her room. I won't be as bugged by it then.

I didn't start doing things like that until 9. Mostly curious if it's normalish or not.