my son is strange

My son is 21 months old and is so fascinated by me puking lol. Usually it's in the morning when I take him and me to go potty and I feel nauseous. I'll tell him I have to puke and he'll pat the potty and say "mama puke" or will pay my back. He's not even scared of me doing it and I'm so obnoxious when I puke everyone in the house can hear it. I find it so interesting. He always has to come with me when I do it.