The 'high place phenomenon' is the sudden urge to jump off a high place, such as a bridge.
BIZARREPEDIA, shenhuifu.org

The High Place Phenomenon, also known as “The Call of the Void” is a sudden, strong, but usually very quickly dismissed, urge to do something incredibly stupid, usually associated with jumping off a high place.

Preview photo credit: BIZARREPEDIA
Source: medicaldaily.com/high…