Bored on the way to work?
Sitting on the bus/train/tube, simply pretend you're on the phone to a friend and tell them about your recent 4 week tour of Mexico.

Hang up.

Then sneeze.
( K2k6 has a proper job these days, Wed 29 Apr 2009, 9:05, 5 replies, latest was 15 years ago)

Ahaha!
Mate, this is GENIUS! I'll be doing this on the bus later.

Newsletter, or it didn't happen.
( Noeli overtheshoulderboulderholderthingstraplatchboobs, Wed 29 Apr 2009, 9:16, Reply)

^This
Deserves to be this week's tip
( chart cat has an itch, Wed 29 Apr 2009, 19:13, Reply)

what
would you do if the phone ACTUALLY rings
(Lord Chode, Wed 29 Apr 2009, 18:16, Reply)

You can have it switched off
or on silent.

Or actually be talking to a mate who's in on the joke.
( K2k6 has a proper job these days, Wed 29 Apr 2009, 21:46, Reply)

Or
Just say "Hang on, I've got a call coming in on the other line", and confuse as well as terrify.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Thu 14 May 2009, 9:59, Reply)