My friend Penny swears she didn't shriek. She is basing this on her personal knowledge of herself, which includes the strong conviction that she is not a shrieking sort of person. She has known herself longer than I have known her, so I will concede the point. I will just state for the record that Penny emitted a brief squeak of very high pitch and decibel level that was completely out of context for the conversation we were having.
I no longer remember details of the conversation, but she was holding up her end of it when she decided to clean up a few dishes that had been left by her sink, and noticed a teabag in the bottom of a glass tumbler, and reached in to pull it out, and it was a little damp and a little squidgy but just a bit larger than your average teabag, and before she was able to fully process this observation, a wing unfolded on the teabag, which was revealed to be, in fact, a bat, and that's when the thing that couldn't have been a shriek happened.
Dave enjoys this about me. At least once a day he sneaks up on me in some way that will cause me to shriek. He claims he is merely monitoring my heart health for me, but he is really doing it for his own entertainment. He can count on my reaction even though I've been on the lookout for Sudden Dave for years. At some point in every day I'm going to drop my guard, and there he'll be.
I'll put my nose an inch away from a spider in an orb web to admire it. If a spider walks across my pillow--and it would have to be mere inches away from my face for me to see it without my glasses--I'll jump a little, but still have the emotional wherewithal to calmly relocate it out the window. I could watch bats swooping in my vicinity all evening. But put that same bat in my bedroom when I'm not expecting it, and I'll fill my shorts. Those little black spiders that run like the wind give me the willies. One day I stepped into the very center of a patch of baby snakes and they wriggled off in every direction. I thought the ground was boiling. Everything inside me--food, bones, organs, dreams of glory--liquefied at once. I don't remember what happened after that, but I'm pretty sure there was some cleanup involved.
Maybe bats startle easily too. Maybe it just fainted dead away at the very moment Penny didn't shriek.