hmm...

thermal dynamics ( hot air does rise, and will take anything it can with it!)
Inter-species relations (yes, there are some people who just might be from another planet)
Stand-up philosophy - Ever meet a kiltie who didn't have some crazy story to tell over a pint?
Leather work
improvisational needlework carpet needles are not just for carpets anymore
Substitute MC - a kilt, a pint and a microphone are not to be used together in public.

Lately I've been working on my skills as a semi-professional wingman. It seems that no matter how shy a guy is, put him in a kilt and he is an instant hit, and my single drinking buddies can sometimes use the help.