I had a couple at a wedding fayre and after 5-10 minutes of discussing their requirements, venue etc. the guy started being quite aggressive with me, leaning right into my space (face about 12-18 inches away from mine) and TELLING me that I should give him a "Thursday discount" (for obvious reasons). When he did this, the bride to be started smirking, as if this is a normal action for him and she expected me to change my price because of it. At that, I apologised for my error and told him that I had, in fact given him a wrong price - both of them started smiling at each other as I started banging some figures on my phone's calculator. When I showed them my revised price (almost 3 times my original) he replied "You're having a f@@king laugh?" I smiled and politely told him that I love and enjoy my job, will not be intimidated by an overgrown adolescent and that the new figure was exactly what I would want if I were to spend 8 hours with them both. His reply, as they walked away, was almost as literate as his "having a laugh" comment.
Be polite, be professional and don't be afraid to say 'No'.
2x 7d, EOS 3 film body, G15, X-Pro1 with 18mm f2, 35mm f1.4 & 60mm f2.4 macro, Kiev rangefinder with 50mm lens. 70-200 f4L, 17-40 f4 L, 50mm f2.5 macro, nifty fifty, 20-40 EX HSM, Samyang 85mm f1.4, Rokinon 8mm f3.5, 2x Fuji X-Pro1, Fuji XF 18mm f2, 35mm f1.4, 60mm f2.4 macro, 3x Yongnuo 560 II, 540EZ, Phottix Strato 2 wireless triggers, extension tubes, Manfrotto 055 tripod, manfrotto monopod.