An ex-colleague of mine used to pull the phone away from your head whilst you were using it
Your natural instinct is to pull it back, at which point he left go and you smacked yourself on the side of the head with it, while still trying to keep a straight face and talk to the customer.

The cunt
( sporters I’m sincerely gratitude to you, Tue 18 Oct 2011, 12:52, 2 replies, latest was 14 years ago)

That's quite amusing
in a 'but I'd be annoyed if someone did it to me' way.
( scarpe We Stole Bikes, Tue 18 Oct 2011, 12:59, Reply)

It is very funny to watch

( sporters I’m sincerely gratitude to you, Tue 18 Oct 2011, 13:03, Reply)

I used to convince people that by attaching a paper clip to a rubber band, you could make it go far further
However, I'd discovered (painfully) that you couldn't fire it from your thumb if you did this, as it'd usually rocket quite hard straight into your nail. It seems that I wasn't the only one who hadn't considered this could happen, as everyone I suggested this to ended up with very sore fingers.

Very funny to watch, very painful to have it happen to you.
( Agnostic Antichrist Baltimora, Tue 18 Oct 2011, 13:05, Reply)

Haha
Once at work, I'd been using the mouse at someone else's desk, and not paying a huge amount of attention. As I stood up to walk away from the desk, the phone rang, and no-one was available to answer it. So, I walked swiftly back, and picked the phone up.

What I hadn't realised is that I'd laid the mouse wire over the phone cable, so when I picked the phone up in a hurry, the mouse took off, nearly hitting me in the face. The next 10 seconds were some of the most difficult of my life, as I tried desperately not to laugh as I put the customer through.
( Agnostic Antichrist Baltimora, Tue 18 Oct 2011, 13:00, Reply)