I have to confirm the "Go for a cup of coffee to get to know new friends" by GROOX. I've had similar experience, walking the Nanjing Rd., a young man started talking to me, saying he's from Japan, living 1 year in Shanghai... Ok we talked together and then he offered to go to a bar where young people, mostly student go. I resisted for a while but then decided to go.. Well, I should be warned.. we went into a bar off from the main Nanjing Rd., nobody was there except few girls. We sit down and the girls immediately come to us. I tried to stop it but we had 3 beers and some refreshments for the girl... I said stop and asked the bill (the man that got me there got away saying he's paid his beer). The bill was 374 Yuans within those 5 minutes we were in. I argued with the staff, however they started to surrond me - really not feeling well, especially with my phone left in the hotel, so no chance to call a police or whoever. I argued it down to 100 for the 3 beers (of course the cheater didn't payed for it) and got away. I've been also offered by several girls to go for a drink, however I was warned by GROOX's tip. After that, when another girl come to me again on Nanjing Rd., I told her I've just had bad experience of very expensive bar and she only said "ooops" and turned away - so you can imagni yuorself what it's all about.