Why do some dress shirts have extra buttons at the bottom?

[Unheard]

In case a spider rips off one of your buttons, you can replace it.

 

[theprodigalrebel]

I only get 200 channels but my TV stores up to a 1000. Are those like...spares?

 

[Rage187]

Rock Salt

 

[FoBoT]

strikes

one more than a spare