... you can recognise your callsign in FSK - by ear

... there is a slab of molten silicon, plastic, and precious metals where your transceiver used to be

... you've lost your microphone and morse key, but didn't notice for three weeks

... your XYL only speaks to you in thirty second bursts

... you never answer the telephone because the ring tone won't decode

... you buy another hard drive - just for WAVs