A childhood belief about general

My grandma used to have a birdhouse in her front yard, and squirrels would always get to the birdfeed before the birds ever got any and so she'd never have birds flying around like I guess she wanted. She used to stand at the window and get really angry at the squirrels, yelling "Get away from there you little bastards!" and so I grew up assuming that the animals that were after the birdfeed were "bastards". One morning, I noticed them before she did and I could be heard o'er the land screaming "Grandma! Look! I see a bastard already!"
My mom wasn't impressed at the time but we all find it quite amusing now.