I went to an arborist on the street and asked them to dump a full load of shredded trees at my house so I could compost it.

I put a turkey outside to watch it decompose.

I socialize on reddit.

I went into a room and wrote the same calculus exam for 2 different guys at the same time.  Not simultaneously, but in the same sitting.

Actually, I did that double-exam thing twice. One of those times, I wrote one of the exams right-handed and one left-handed.  I can't really do that, but I did it anyway.  It must have been legible enough....both raised their marks and passed the course, as I guaranteed.

I told Al Gore how to invent the Internet.

What’s the nerdiest thing you’ve ever done?