Just remembered one I did a few years back...
You know you're a hopeless computer geek when you buy an ethernet card for a Mac from 1994 off of eBay just to see how well it'd handle the web in its current state.
No, I'm serious. Paid $5 for an ethernet card that fit this blazing 33Mhz 68k Mac with a 320MB HD. Got it running Mac OS 8.1 so it could run a browser that's still being updated even today (iCab if you want to look it up). Surprisingly it worked fairly well, but javascript-heavy sites were really a bitch to load.