Makes me stop before I begin

It seems that my son prefers skiing backwards to forwards. We spend some Saturday mornings at ski club where he practices and perfects his technique on the slopes with his like minded little ski buddies. I take the opportunity to nip out, do a bit of food shopping and normally fill the car up with fuel and have a cuppa before his half time break. The only tricky part of this manoeuvre is that I have to make sure I get him in, kitted out and on the slope in less than 30 minutes or I'd have to pay for the car park! Of course once I'm back I settle down to watch him as he shows off skiing backwards & gong over jumps!