It's been over 30 years since the famous "WOW!" signal was detected by SETI astronomers. It remains to this day as the best candidate for an extraterrestrial signal.
What is your opinion. Was it:
A) A genuine signal transmitted by intelligent beings?
B) Some sort of anomaly from space (but NOT an intelligent signal)?
C) Some sort of terrestrial interference?
D) Caused by a glitch in the equipment that recorded the signal (despite the consensus that the equipment did not malfunction)?
D) I dunno. Weird.
For further reading...
http://www.bigear.org/shostak_wow_20021205.htm