Yellow jackets are angry this time of year. Often they have nests in the ground. Like on mt bike trails. What's worse than riding over a nest? Being the 6th person to ride over the nest. Bad. 3 stings on the back of each leg, one on the shoulder and on one arm. Was doing the angry man mt bike hill climbing crazy pace for the next 45 minutes. Like natural dope. Just angry and they itch for more than a week for me.