Stickers That Don't Stick

When I was done student teaching my senior year of college, my sponsor teacher bought me stickers.  Unfortunately, I haven't been able to use them until today.  Now they are in the garbage.  Maybe keeping them in my closet made them lose all of the stickiness.  I took off a few stickers, and they were completely dry on the back.  The only way kids could wear them is if they taped them to their shirts.  How could stickers lose their stickiness?  What a waste of about 400 stickers.  It's not my sponsor teachers fault.  It might be mine for not using them for so long.  When I buy stickers again, I will make sure I use them quicker.  You gotta love first world problems and random blog posts.  Good night!