Definitely, game a couple of years ago I was batting, the oppo went up twice for caught behind, it was close but I wasn't sure, umpire didn't give it. Cue half an hour of filthy abuse for me, then I took a big stride outside off and left a back of a length ball that ducked in a little. I'm 6'3" and was standing straight upright and it's hit me on the thigh pad, not to mention I'm a good foot outside off. Never seen an umpire's finger go up so quickly. Happens all the time, even in pro cricket/football, when umpires realise they've made a mistake and subconsciously want to make up for it. Even had the odd dodgy lbw off blokes umpiring their own team sometimes.