A swedish documentary film maker , FREDERICH JURGENSON ,claimed that in 1959, when he made some recordings of bird calls, the voices of several of his dead friends and relatives came on the tape! The voices were not heard clearly , and it can be understood only after hours of repeated listening. It is not yet certain whether the tapes made by jurgenson are hoaxes or not. Experts , after years of study,opined that such electronic recordings are controversial as it leave the listener prone to misinterpretation due to wishful thinking.......its true yar.... Hope you guys enjoyed it thanks to read it guys.....haha