One of my kids jammed a stainless steel cup into kitchen sink exaclu 2 mm bigger than the gasket...

The other night, my wife noticed sink not draining when she hit the insinkerator switch. I check it out and discover it's a cup shoved in there. I assume it's glass initially (which I could shatter, and pick pieces out) but it's stainless steel AND it's bigger than the rubber ring, but somehow been shoved past it.

I try needle nose players to pull out, but as soon as I grip, I'm forcing other side rim upset the hole so it can't come out. I try a lot of different angles and eventually decide to try to bend in the edge on one side to shrink the diameter, but it's a rough go. Lots of force to get a little bit of a bend into it, not enough to shrink the diameter and the amount of force is limited since I don't want to damage the sink. Also do not want to remove and then reattach insinkerator.

I have to drive out to Home Depot at 9pm to buy Aviation snips, which does the job. I feel handy.

None of the kids will own up to it.