Oooh, it will not be a pretty day if one of my kids gives me a "maybe". Of course, they are only 17 if you add up all their ages at this point.
What I say is "not right now" and my kids very often ask me something and I sigh and they say "I know, not right now." I feel bad that their expectations are actually very modest for working class American kids. Though Dad still manages to go crazy every Christmas.
The last couple of years I've tried to get Christmas squared away early to avoid last minute sprees. This year I'm not buying anything because I know it won't prevent the last minute spree.