Had something similar on Turbine. All engies building a wall of sentries using the logic that the knockback would be uncontrollable. I was the only person on the team not engie (Medic) because I know, as funny as the plan was, it would fail.

Almost all of the enemy team goes demo to lob stickies, and a vote starts to kick me because I'm not engie. Unfortunately, the demomen broke through right as I was kicked, and the last thing to grace my ears was an engies death groan as he was gibbed.