[heleninboodler]

The joke is a reference to the index finger cursor. It doesn't really work unless you're using the middle finger in place of a index-finger-pointing-up gesture.

[vishnugupta]

> index-finger-pointing-up gesture

This exact gesture is used by umpires in Cricket to signal a batsman out.

[leegraham]

In that example the umpire's palm is facing the batsman, so that joke still doesn't work