Click from the glove box when rear wiper is on

When I have my rear wiper on, just as it completes its full wipe, I get a click from the glove box area. Does anyone know why this happens?
 
Now I think about it, the rear wiper has been reluctant to move sometimes and I've had to do the spray at the same time to get it to move.

Cheers chaps.
 
I had this on my old non sport clio mk2. It got really anoyying untill I learnt to deal with it. *puts ear muffs on*
 
Happened in my old clio years ago...happens in my current clio now... Pretty standard by the sound of it. (No pun)
 
if i did not do it on my megane, i can not see y it should do it on the clio, ill be taking the relay out of my megane :tongueout: