Wiper switch circuit breaker and a jolt

Weird things can happen with high voltage. It doesn’t follow the obvious path sometimes. If it is an inductively induced voltage by stopping the current in a winding, the voltage will rise until it finds a path.

Could it be static electricity that shocked you? Similar to walking across a carpet and touching a doorknob?

Taking switches apart can be a challenge. Could be very likely that it didn’t go back together right. Does the circuit breaker still pop with the switch unhooked? Does it pop with the wiper motor unplugged?