I bought the Lunar Lander Module lego set for $40, built it, and had it in a cool place in my room. Then one Easter my sister threw her paddle-ball toy at it. Yeah, I had lost the instructions, so it's still partially destroyed somewhere.
Also, I remember Mega Blocks. You remember, those cheap legos that sucked because they didn't stay together nearly as well as Legos? Well, someone got me a big robot from Mega Blocks, and my god, I must have spent months getting that thing together because whenever I got to a decent spot, the whole thing would just fall apart. But I got that bastard together, and then a few weeks later my cousin knocked it off a table by accident. I shoved it in a box and never looked back.