I took the above shot on my cell phone yesterday, riding the Taipei MRT from Longshan Temple to Dunhua and Chungshiao.
Here's the situation: person gets on the MRT and leans up against the pole that is in place for passengers to hold on to (see above pic again). People already holding on to said pole are forced to remove their hands. This in fact the second time this has happened to me recently. The first time, I was riding the brown line to Guanqian Station and a middle-aged man got on. He was about to take hold of the pole when he noticed my hand also attached, so he quickly retreated with an aghast expression, like I had cooties or something. After turning to another pole and finding his access blocked, the middle-aged man then turned his back to me and proceeded to lean up against my pole, crushing my hand in the process.
I was talking to a friend about this. He told me he's also encountered the tactic, on numerous occasions too. What he does is flex his hand so his knuckles stick out, so that the offender can feel them in his or her back. Then he wiggles his fingers until he gets a response. Not preferring such antics, I go for the much simpler verbal appeal to reason: "我怎麼扶欗杆?" or "How the heck can I hold the pole now?"