What happens when, on the phone or instant messenger, someone needs to go (or fakes needing to go to end the conversation) and says "bye" (or a variant, or an IM shortening of it like 'cya').
The other participent says "bye"--or something-- The original person says "bye"/whatever again, and the other one responds. This can go on for minutes or longer until someone--or their parent--puts their foot down.
ExampleScreenName1: well i g2g
SampleSNperson8: call you later
SampleSNperson8: yea, cya
ExampleScreenName1: OK I HAVE TO GO NOW!!! PARENTS!!! GAH! BYE!
SampleSNperson8: OK!!! BYE!!!