After reading UK Citizen flying to US, then Canada, then back to UK - How does this affect Visa Waiver Program? I am wondering:
If you are in the US, travel to Canada and re-enter your VWP clock didn't reset. This is classic.
There are countries, in particular in Central America where a brief visit does count as a "reset".
So what happens if you go USA-Canada-reset country-Canada-USA?