That time when SHIELD asked Clint to help redesign the Helicarrier, since he was so good at bringing it to his knees. I think this would difficult for Clint, but that he'd want to do it, to help, and maybe he tries to go it alone...but Natasha of course finds out and joins in...and maybe the rest of the team do too. Steve with tactics and Tony all 'excuse me, am I or am I not the engineer of this group?'