April Fool

It's that time of the year again and it's time for a prank. Tell us what pranks have ever occupied your day, so much that it made you annoyed for being troubled by it so much.

As for me, there was once upon a time, when I spent the whole day scratching my head, wondering why my laser mouse didn't work. Turns out it was something like this:
Mouse Prank
This is just a picture I found off the net, but it's similar.

I've also gotten these in the past years.
1) Why won't my soda open?
Soda won't open

2) Door buzzer
Door Buzzer

3) There's a leek in the bathroom
Leek

And some others.

So what kind of pranks have you received or given to your friends and families so far?

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