When your fellow passenger’s dinner floats away from his mouth with weightlessness, gently push it back in his direction. Be doubly careful at your toiletries and remember, breaking wind in these rarified atmospheres can be positively dangerous.

Arriving on the foreign planet, do not display your clod hopping primitive ways but attempt to imitate their modern ones. And don’t above all try to get funny by telling a long string of earthy jokes to the first foreigner you see. Nor attempt any carnal linkage or saucy dovetailing until you know for sure where to put your what for into their this is it. Also you better hope to god you can get it out again. As you wouldn’t know what the hell kind of magnetics they’ve got out there in some of them galaxies.