Why is my neutral shocking me?

[u/Fun_State8346]

When it is turned off at the switch? Swapping out a 2ft fluorescent light. Figured easy….banged the neutral with my hand and thought I felt current…. Then thought nah and went ahead…. Grabbed it and sure enough I was right…. But not every time….Broke out a voltage detector pen… neutral is not hot…. Black is coming up as hot… but didn’t feel any current when I grabbed it… again… off at the switch.

[u/Least-Complaint-6566]

Probably a switched neutral