As with any behavior, if the consequences become painful enough the behavior will stop.
From Reuters via MSN, November 15:
Climate-change activists on Tuesday smeared and glued one of their hands to a glass screen protecting a Gustav Klimt painting in a Vienna museum to protest against oil drilling, on a day when entry was free thanks to an oil firm's sponsorship.
"Is that a man-bun? I haven't seen a man-bun in years?"
Activist group Last Generation posted images online of one supporter pouring what it called a "black, oily liquid" on the screen in front of Klimt's "Death and Life" at the Leopold Museum, before being intercepted by a member of staff while another activist apparently glued his hand to the screen....
....MUCH MORE
Well, at least it wasn't one of the Adele Bloch-Bauer pictures.
In other protest news: