Replying to Convince the shit out of my parents

Ok so here's the deal: I got sick as fuck at school today, puked a lot, and came home. I looked really shitty, but slept for a couple hours and suddenly felt 100% normal. I spent the night out with my family bowling and seemed fine. My rents still don't want to let me ski all day tomarrow and I got to convince them I'm good cuz wer getting a bunch of snow. I seriously am feeling perfect and know I can ski. How the hell could I convince them that I'm good. I said I was gonna get up early and see how I feel and act as awake and energetic as possible. Anyone else got some tips?
P.s. I actually got sick from smoking a shitload of weed before school so that was the cover up. So, I know that I won't feel suck tomorrow.