My GFT examiner leaned the mixture on take off to simulate an EFATO in a Tomahawk......I was so taken aback, that I set it fully rich again and closed the throttle instead!......I accept (and now understand the mechanics) behind Foxmoth's point about windmilling etc. but it did seem awfully odd and dangerous at the time....I thought he'd made a mistake...I think he thought I was a smartarse but he passed me anyway!