Favorite Home Alone Trap?

Home Alone is a timeless classic (the first and second one anyway) and I want to salute the little sadistic genius who came up with all that stuff.

For example, the heated doorknob. I never would have thought of that when I was eight. I wasn't even sure what he used to do it.

What were your favorites?

Also the nail in Marv's foot one makes me cringe every time. All the other ones are too funny or over-the-top but the sight and sound of that nail sinking several inches into his flesh is....*shivers.

I was just coming in to mention the nail one. Aside from that and what you just mentioned, I can't remember any of the other traps. I love the first two movies. Home Alone 3 and 4 can burn in hell!