Backstory: DH and I have been trying to get pregnant for over 2 years now. He comes from a family of "fertile myrtles": everyone gets pregnant as soon as they begin trying and they don't seem to understand why it's taking me so long. They mean well and love us both but are obviously unsure of what to say to me, the one diagnosed with the problem. (I apparently can't ovulate and will go a year-plus without doing so). They know we've got doctor's appointments and that I'm on serious medication for this issue. They're usually lovely, wonderful people but sometimes ....
Our story: FIL is into antique guns, modern guns, handguns, revolver guns, etc. If it can go "bang!" he likes it. All three of his sons (including DH) take after him, though none of them has quite his collection. Last Christmas, FIL gifted all three boys with miniature pellet guns (BB guns? I have no idea - not really my area). They are child-sized and meant to be given to our children. We thanked them for the gift, knowing it might be awhile before we get to use it and accepting that it might never see any use. BIL1 and BIL2 both have kids but obviously DH and I are childless. I believe DH put the BB gun in the gun safe as he obviously has no immediate use for it. It's sat there ever since and I forgot all about it until last week.
We were invited to the IL's house and FIL was showing off some new gun he'd bought/found/salvaged/whatever. He also mentioned that his oldest grandson was nearly 8 and old enough to learn to shoot. He asked what we'd done with our BB gun and I think we mentioned it was in the gun safe at our house. FIL mentioned that he'd bought those BB guns "For his grandkids."
I thought (but obviously did not say aloud) "Well obviously."
FIL then continued with, "You owe me a Grandchild!"
My jaw hit the floor and I got quite embarrassed. I have yet to build up any kind of polite spine so I reminded him that I'm being treated for my infertility and that I've arranged to meet with a new doctor (all of which is true and really not his business, in hindsight). He seemed to realize his error and laughed it off as "Oh we love you anyways, you know I didn't mean it, blah, blah, blah," but it definitely left an impression on me.
I love my ILs, I really do, but sometimes they just set themselves up for e-hell fodder.