Be careful what you say

It was a slow day at work yesterday, and as I lurked around various sites, this particular one reminded me of the bloopers my teachers made back when I was in school:

Scene 1:
(During a lecture, our lecturer was exhorting us to be more vocal in class)

Mr Y: Par-sur-pation is good, everyone should par-sur-pate in
class...
Students: Did he say mas-tur-...? heehee
Mr Y: (oblivious) It is very important to par-sur-pate as much as
possible
Students: heeheehee
Mr Y: What? What? What are you laughing at? What's wrong with
par-sur-pation?

Scene 2:
(During a computer tutorial, our Aussie teacher was trying to show us how to manipulate images)

Mr W: Let's pick any image...(look through his list of clip
art) ah, let's use this banana. So, if you want to make my banana bigger, all you have to do is click and drag it...look how big it is now!
Students: *much glee*

Ah those crazy school days. How I miss them!