how to really suprise your wife

we were laying in bed..winding down...exchanging conversation..no really just talking....when i answered a question...my wife just stared at me with shock, not mock shock, but total shock (okay and a little confusion)...you see the question i answered was asked of me about 27 hours prior..i just never answered then...i think i forgot to...so there it was....and they say men cant remember what our wife's say....hah...