First commenter with an idea gets that idea doodled, I reckon.
UPDATE:
For Manx – Whatever the second commenter wants.
30 seconds were spent on this doodle. I still have 30 seconds left to populate the thought balloon, based on the idea of the next commenter. 
UPDATE! (Part 2)
For PJ – the Spice Girls being attacked by a sabre-tooth tiger.
My idea: Whatever the second commenter wants.
The Spice Girls being attacked by a sabre-tooth tiger.
Nice one! Thanks to both of you.
Man, this doodle bit you’ve got is awesome.
pj, you’re welcome!
jon, thanks kindly.
I tell you what I want, what I really really want…