I've sort of been a recipient of a holiday limpet, recently.
(For context, I'm SE Asian by birth, but of East Asian appearance, and I have lived in the UK all my adult life.)
We (DH, teen DDs and me) were in Stratford-Upon-Avon, doing the Shakespeare thing. In the ticket queue at the Shakespeare birthplace museum, a Chinese tourist came up to me with a hopeful expression. He started by asking if I spoke Mandarin, I answered "A bit, not that fluently," and he asked a few questions about whether he was in the right queue and how much his ticket would be. All fine. Good deed done, I thought.
Then once in the museum, Mr Chinese Tourist properly latched on to us. Followed us round every display case, decided that DH would be his photographer, and kept asking me to explain the exhibits - even though it was patently obvious that I completely lack the Mandarin vocabulary to explain Tudor inkstands, Jacobean cloaks, or wattle-and-daub construction.
Every time we shook him off, he managed to reattach himself. At one point, I'd managed to hide myself behind a big ruffed mannequin, Mr Tourist latched on to DDs and was disappointed when they could only stare blankly at his stream of Mandarin questions, so he managed to demand "Mother" at them until they came to get me!
Eventually he escalated to including us in all his photos of the old house, getting us to pose looking at the tassels on the bedcurtains and so forth. DH tried to run away to the next room, and got called back with a frantic "Hello! Hello!"
Things reached a peak when we were talking to one of the staff explainers about the details of Tudor glove-making. Mr Chinese Tourist bustled in and began rearranging us like mannequins in order to take his photos. The explainer was completely bemused, and I whispered "We don't actually know him!" - this caused great consternation and a stream of apologies to us, and a stern instruction to Mr Tourist: "Sir, please do not manhandle other visitors!" which fell on uncomprehending ears.
By the time we got to the next room, the explainer had called a museum supervisor to come and rescue us from Mr Tourist, as they were concerned we were being harassed! (We did feel a bit harassed TBH, but I assured them we would be OK).
As we got to the end of the exhibition, Mr Tourist asked me, in confusion, "Where is the bit about Shakespeare's school?" and I explained that his actual school was elsewhere in town and showed him where it was on Google Maps. He was very grateful and inquired, "Are you all going to visit the school next?" You will be unsurprised to learn that my response was a polite version of "FUCKING HELL NO WAY!" as we all scarpered out of there so fast that we didn't even pause in the gift shop.
Later we were musing about Mr Chinese Tourist's holiday snaps - when he gets home, will he do a slideshow to his friends, "Here's a random confused British family I rearranged into poses, looking at a Tudor beam, and next to some bedcurtains, and here they are holding a glove, and here's the security guard looming at me..."