The greatest examples of presence of mind?

One of my friends (say X) had an interview at a Pizza center. He took me with him. Manager told him to wait for 20 minutes and went out of cabin for some work. We both were waiting outside on a desk. I noticed that there was discount on a pizza offer and I was a bit hungry so I could not control myself from buying a pizza, so I bought a pizza and came to the same desk. We both started eating, as soon as X was about to take a slice to eat, Manager came and was glaring at us . X saw him but I was busy eating.

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(Manager= M)

M :- What are you here for? (sarcastically)

X :- For an interview, sir.

M :- So, what are you doing ?

X :- Tasting this pizza.

( I was still busy eating pizza.)

M :- Who is he beside you?

X :- He is our customer, sir.

( I was like what did you just say!)

M : - Come at 6pm from tomorrow, you can work by evening shift.