How do you say PANTS?

Last night I read Adrian a book called Dance, Pioneer, Dance.  It's about pioneer's country dancing with animals.  It's cute.  I was singing the words.  Out of the blue Adrian starts laughing then says "pANTs. hahaha! pANTs."  He said "Mom that is funny how you say it."  For 2 days I have heard him repeat how I say pANTs.  He has laughed and laughed over me saying pANTs.  We have laughed at his humor with the word pANTs.  Oh he how he brings joy to our lives.