playing with my mind

We (I) decided to keep 2.5 y.o. home for the next three days.
Why? You may ask. Well, I was planning on toilet training him over he summer.
Specifically why now--We were out for shabbos day and one of the kids there was toilet training (there's gotta be another term); it's before the 9 days and its laundry limitations; I hope to go away at the end of the summer;he's between school and daycamp, so it's a great transition period.
I really thought that he'd be ready.
He's sat on the toilet , both productively and not, over the last few months, he will tell me when he's wet/dirty, he knows what to do, he's got control, need I continue?
Day 2 began with us in the living room with Lego and Bristle Blocks (remember those!?!).
"Hey, cutie," I began, "where are you gonna' make?"
His immediate reply o me was, "on Lego"
"No, c'mon, where are you going to make?" I persist
"On floor!" was his bright reply
Now I'm really getting frustrated.
He's used the toilet (sitting and standing) all day beautifully the previous day, and now he's got "my new one, new potty" to use as well.
"Really, where are you going to pish, when you have to?" I come back for more--
"OK Eema, on loitet" he says (NOT toilet, but loitet!)
"and on the ..." I prompt him
"on the new one! my potty"
He's totally playing with my mind!