If my chin is in a bog its normally because its the first thing that's hit the ground...good effort OP.
Personally, I've only managed to get thigh deep. A mate once jumped on a frozen puddle on Beinn Riabhach above Fort William on a "day off" and went in up to his armpits. The bog was only as wide as his shoulders. We seriously struggled to get him out...as it took several minutes to be able to stop laughing. Fortunately it was only a short run down to the chip shop (we were students and rough camping behind the distillery so couldn't afford to waste time on good pub money in the middle of the afternoon just to get him warm.)
Another mate managed to fall up to his waist in the same (snow-covered) bog on the way up, and on the way back down, Fionn Bheinn. A very obvious continuous dip/drainage ditch crossing our path. You could clearly see the hole a few feet to the side where he'd fallen in on the ascent, yet still he went straight into it again. This is why we still invite him, 30 years later, as the potential for similar incidents still remains.