Linney is writing a book. Perhaps the other Excellent Cats can contribute further chapters.
The Excellent Cats' Guide on How to Cat Successfully
Chapter One - Vomiting
If you are outside and you feel sick, return to the house immediately, and seek out the newest, cleanest and most expensive piece of carpet. You should avoid vomiting on surfaces which are easily cleaned.
When you've found your best spot, make sure your owner can see and hear you.
Performance vomiting is recommended. Try to replicate the sound of your owner using a sink plunger in reverse, for as long as you can manage it.
When you've finished being sick in one room, run off to another room and find another spot which the owner cannot easily reach for Round Two. Bonus points if two people have to move a piece of heavy furniture to reach the vomitus and clean it up.
You can leave the house again once you've stopped being sick all over it.
(N.B. If you're producing a hairball, it's good practice to do so in front of an inexperienced owner. They will invariably think you've brought up some poo and get very, very worried.
This can backfire though, if they then book a vet's appointment for you. Try to encourage them to use Google to avoid this eventuality)
-oOo-
<<<inspired by Linney actually doing most of this today - apart from the hairball scenario - we have seen too many to be fooled nowadays>>>