Phineas and Ferb2007

Dr. Doofenshmirtz:
Ah, Perry the Platypus, you're early! And... and I'm in my underwear! Oh, this is so embarrassing. And it's... it's the pair of underwear you never want anyone to see you in, too. You know the ones - they're faded and frayed, and the elastic is so worn out you have to hold them up while you're walking around the house, and then you roll the wasitband, which make your pants look all lumpy; and, yet, when you take them off, you find yourself mysteriously putting them in the hamper rather than the garbage. W-why do you do that?