This is an art installation from an artist called Kristan Saloky. It's from 2011 but I don't think I have seen it posted here before. I can't find any other information about it so it's not certain whether someone is actually tickling her or if she is acting. But she is doing a pretty good job if she is.
Both videos are more or less the same but one is longer than the other.
https://vimeo.com/56170734
https://vimeo.com/39759912
Description:
Kristan Saloky
kristansaloky.com
Gargalesis (Do We Not Laugh?), 2011
Four-channel video and sound installation
Slade Research Center
Woburn Square, London, UK
Despite the pain often resulting from gargalesis, or heavy tickling, laughter is the natural bodily response. The bodily response to tickling is unique because it cannot be reproduced without the involvement of another. In Gargalesis (Do We Not Laugh?), however, the site of transgression is removed from the spectacle of the installation.
Both videos are more or less the same but one is longer than the other.
https://vimeo.com/56170734
https://vimeo.com/39759912
Description:
Kristan Saloky
kristansaloky.com
Gargalesis (Do We Not Laugh?), 2011
Four-channel video and sound installation
Slade Research Center
Woburn Square, London, UK
Despite the pain often resulting from gargalesis, or heavy tickling, laughter is the natural bodily response. The bodily response to tickling is unique because it cannot be reproduced without the involvement of another. In Gargalesis (Do We Not Laugh?), however, the site of transgression is removed from the spectacle of the installation.