I love Crocs. They're so comfortable, and I can wash them, and they're ventilated. Goodbye tired smelly shoes, hello Crocs. I started out with 1 pair (pale yellow), then fell in love and instead of wearing the same pair of shoes every day (to be alternated with birkenstocks), I bought another pair (light blue). Then (and I do NOT have a shoe problem) I felt I needed a "formal" pair to go with my darker clothes, thus I bought a brown pair (for when I cough cough dress up while teaching) .
So then I started getting the bug. I HAD to HAD to HAD to have a purple pair. And this was no impulse purchase. I thought about it long and hard and searched and searched, but alas, it was not meant to be. Then, while in St. Louis at the math conference we went to the mall one evening (to be true, ahem, Americans you have to go shopping at a mall while in new cities) my eyes grew wide and my breath caught, and I saw a kiosk full of Crocs. And, yes, you guessed it, they had purple in my size. So now I have 4 pair. So far.
Now it's a given that students may not remember math formulas or recall facts they learned from yesterday, but they will notice when you are wearing new attire. When yet another student mentioned my new purple Crocs and asked where I got them, I mentioned that I bought them in St. Louis. Then I said, "you know like a souvenir". Ar ar, I thought I was being funny. Well, another student topped that by saying, "don't you mean a shoe-venir?"