They normally figure out within the first session that I have past experience. I dont go into too much detail, but more people seem happy about that then bothered by it.Just a thought here, if you have someone with a high grade in another style joining you who is happy about wearing a white belt do you let other students know he has a higher rank in another style? The reason I'm asking is that I went to a friend's class in JKD for a while, just to see what they did really and to enjoy something different, I wore a white belt of course but later after holding pads, then punching and sparring a couple of older guys got a bit shirty because they seemed to think I was somehow cheating because I hadn't said I was a blackbelt and quite a highish one at that. Tbh I didn't think I should have, it's quite different from what I do usually. They had tried to make things difficult for me by punching the pads harder than they would for a white belt on their first session and were trying to show off when holding the pads. I think they were miffed because it didn't bother me. I told my friend later and he sort of smiled and said well that's one of the reasons I invited you! Er thanks....., I think. Couldn't get on with JKD though, made my knees hurt even more than karate.