This happened in 1969, during my first tour of India and Pakistan. We were playing in Dhaka and the crowd started to get a bit excited. Bruce Murray, who was fielding at third man, was getting pelted by a few things. One of them happened to be a banana.
Bruce tried to draw the attention of the umpires and began to run towards the pitch. Meanwhile Dayle Hadlee was running in to bowl - to Asif Iqbal, I think. We could all hear Bruce yelling, but the umpires didn't notice.
Dayle delivered the ball and it ballooned off the batsman's gloves to the vacant gully region - which wasn't vacant anymore because Bruce had arrived there, banana in hand, dived forward and caught the ball!
He actually claimed the catch, but the umpire cancelled the appeal.