Is this normal to both native and non-native speakers?

I was having a conversation with a friend and while trying hard to recall the word "psychedelics," "calisthenics" came out of my mouth instead. He just looked at me.

I understand the meaning of both words, but I still can't understand why my brain made that mistake. I feel embarrassed anytime I think about it.

Tell is this normal? I will appreciate if you could share if you've had such experience before.