When you are talking to either a single person or a group of people and you happen to crack a joke; that joke leads to the drive-byheckle: a total stranger happens to walk past and puts their two-cents (usually a cheesy pun) into what you just said.
Jack: ...what if in the future, making fun of someone for their age was illegal?
(Large lady in a hat walks by)
Large lady: It should be illegal NOW! (walks away)
Joe: Drive-by heckle.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.