10 things where it's handy to have a spare

Leave one in your kitchen and the other one in your backpack

You can bring one along with you while you charge the other one at home

It's easier to leave your charging cable at your desk and if you need to take one with you, you can bring it along in your backpack

Heck, I like having multiple eyeglass cloths so I don't need to scramble to find one when my glasses get dirty

Hugh Jackman and his wife buy two copies of every book they want to read so they can read together

You never know when you'll lose one

In case one credit card gets maxed out

Again, handy to have multiple so you aren't refilling it all the time

You aren't always going to need it but I do find it reassuring to have a spare change of clothes just in case something happens

I'll tell you the most annoying thing is to have your glasses break, but not break completely - especially when you're away from your home (say on an international trip)