keys to my heart (and house)

I often get my apartment keys confused because several of the keys on my key ring look identical: same color, same shape, same everything. And since I don't have the time or interest to find one distinctive mark on the cuts for each key to remember which is which, I settled for a yellow paint pen dot on my current apt key (because I refused to use these) But today, thanks to my Daily Candy emails, I found out just how out-of-date my little yellow paint pen dot actually is. These are brilliant...and fun!