Actually, all Tarrants come free with self-inflating egos—it’s standard issue. Just yank his chain, and fwoosh! You must read the label, though:
“Please wait until exiting the cabin before inflating. There is an additional tube that can be blown on to top up the level of inflation.”
Strangely enough, in practice the spikey Avon never seems to burst the inflated Tarrant—they just rub against each other and produce sparks.
Ooh—did anyone spot the double-entendre? No? Good, I got away with it then.