There used to be an elderly woman who used to approach me in NTUC and beg money off me. It happened on quite a few occasions. Curious, she looked entirely respectable otherwise, and she never seemed to recall that all her previous attempts had been 110% futile.
Then to my amazement, after a gap of maybe 4 years (we were elsewhere) it happened again just this week!

She acted all befuddled and confused when I said 'Ah yes you were the one begging off me here years ago!!'
I'd just about brushed off my surprise at that event, when I was in a nearby food-court deciding what to eat. Up sidled an old uncle, who started chatting, 'where are you from, where do you live, how long have you been here' etc. Then he wanted to shake hands [my 2c: take that as a major warning sign]. At which point, riled up by the last scammer I cut him short. No idea where that was headed, but I'm sure it wouldn't have been to my net-net pecuniary advantage.
Is it just me, or a bad week, and/or do others have encounters like this too?