(a) When you haven't been exercising for months and you suddenly decide it's time to keep fit

+

(b) but then you majorly overestimate yourself and start running like an antelope wild and freeeee

=

(c) you end up stopping halfway to puke.

or

(a) When there's a test tomorrow for some subject that you just can't see the purpose for it at all

+

(b) but procrastination - the big evil - gets in the way

=

(c) you turn into a zombie the next morning.

The Universe always makes sense.

PS: Finally took the skyride and luge at Sentosa and IT WAS SUCH A THRILL. Screaming our heads off while imagining what would happen if we got stuck mid-air. Now I know who's more chicken than me.