Trust me. I’ve been in the biz. Mad Ave copywriters don’t look like George Clooney or Mad Men’s Jon Hamm. But GC credits himself with writing and producing this mini film introducing Casamigos Tequila, created by Clooney and Cindy Crawford’s restaurateur husband Rande Gerber. The commercial is a low-key farce starring one bed, one bottle and musical bed mates Crawford, Gerber, Clooney and girlfriend Stacy Keibler. Clooney’s Copy?: ” It could happen, please drink responsibly.” Does make you want to drink the stuff, hoping it will happen….