Not one but the other

So partway through the evening, Purple had come back to his computer after a long day of coordinating with the guy who's about to go on a month-long vacation (interrupted by an offsite lunch), and we checked in with each other. I had, I announced cheerfully, just found a bug!

Purple sounded sympathetic.
Sympathy was not what I was going for here. I had found a bug! It was awesome! I didn't have to fix it myself.
Purple told me in no uncertain terms that I was weird, and that he hates bugs, doesn't matter which side he's on, dev or user. (Also, that he'd pulled an adorable little caterpillar out of the mint in his lemonade at lunch. He'd been the only one to keep drinking the lemonade after that, since it was a harmless little caterpillar and he's a country boy...)

I explained: if it was a big bug, I would not be happy. But if it was a little bug, I was happy! I found some images to illustrate:

( Warnings apply. )

Little: http://blacksoldierflyblog.com/wp-content/uploads/2009/11/soldier-grubs-hand-feeding-2-BL.jpg

The problem is that under certain circumstances, I can make the tool fail to save data that I've entered. The question is, what are the circumstances, as while I replicated it three times, I'm not sure what exact combination of things I did. I'm going to have to do it again. Yaaaaaaaaaaaay!

Purple says I'm very, very weird.
I say that these bugs are juicy and delicious. Buk buk buk buk buk buk!