Resurrecting a slightly elderly thread I came across, with an interesting and instructive anecdote.
A… pilot of my acquaintance (no names, no pack drill) was approx. 75% of the way through his PPL Skills Test when the examiner tossed his cookies fairly spectacularly. The poor chap said he thought he was ok but still looked pretty greyish.
PICUS pondered the situation briefly, then said the following: "I'm terminating this test and returning to base immediately. I've never been airsick in my life, but there's always a first time, and the smell, or you doing it again, might set me off. I'd sooner be down there booking a new test, than up here with BOTH of us tossing our cookies".
On the basis of this exemplary decision-making, he was awarded an immediate pass!