Lot's of times.
Once on the typical "McDonald's Break" one of the elders had a cold sore that was bleeding like a PIG. Absolutely disgusting, he just kept eating his mcmuffins, all the while bleeding all over his biscuit and napkin. He then piled his bloody napkins in front of me. I almost threw up. (By the way, why don't JW's disfellowship for gluttony? They should since they do for all other sins.)
Another time I was the new Pioneer "on the block", I was put in a car group with the oldest and most established pioneer sisters from the hall. When I went to the door one sister would step one stair below me as soon as the householder answered the door. After about the 10th time I was fed up, so when the householder answered the door I immediately stepped 2 steps below her, forcing her to talk. I was ashamed of her behavior for being so childish and lazy but it felt so good to see her face when she was finally face to face and to give here presentation.