The phone rings. Hmm, an external call, maybe I should get ungrumpy. Alright. "hello, this is alex speaking."
"hello, is this mr. garagedoors?" (some east-european accent)
huh? "no. no garage doors here."
"i'm calling because of right motor on my garage door doesn't work."
...
*sigh* "this is a university."
"oh, i must have wrong number. sorry." *click*

Hamming-coding for phone numbers NOW!