Corkscrews - TSA-allowed; not permitted in Canada.
It also appears that the "personal toiletries" exemption clause in the US DOT regs re: hazardous liquids may not have an equivalent in Canadian regs.

Here's the Canadian list:
http://www.catsa-acsta.gc.ca/english...voyage/bag.htm

Here's the US list:
http://www.tsa.gov/interweb/assetlib..._7_24_2003.pdf