I was taking off from one particular aerodrome having made all the appropriate RT calls - the next thing I knew was parachutists landing just off the runway on the grass.....
At the same aerodrome there was an Eastern European operated twin which was used by parachutists. One snag - the pilot did not understand English....or, if he did, no-one could understand him!
On another occasion I actually heard the 'jumpmaster' announcing that parachutists were in the air - and telling a light ac to keep away or he would be 'reported'. The light ac replied that he was inbound to the field, would the jumpmaster please let him know when all jumpers were down. To which the unhelpful reply "This is an active parachuting site" was given....