I got my mom an iPhone for Xmas two years ago (before I purchased my own). Thinking the plastic thing in the SIM slot was just a packing insert, I proceeded to confidently insert the SIM card from her old phone directly into the slot. I spent the next shameful half hour assembling an extraction toolset from plastic toothpicks, scotch tape, and high-magnification reading glasses.

On the subject of 3.5" floppies: I remember performing surgery on a number of them while working in the college computer lab. I'd transplant the actually floppy part from a case with a damaged metal door or melted from being left in a hot car into a new case so distraught students could (hopefully) recover their files.