Some very good captions, some subtle and some less so....
Third
TyroPicard
Now pay attention, 007
Second
Nutloose
I wish they would buy a pump, blowing these tyres up by mouth is hard work.
Winner
Danny42C
Sub-Lt RNVR:
"Now if I were to uncscrew this little cap here and give the nose a gentle tap, I wonder what would happen ?"
Smithers (takes cover):
"OMG !!" 
So over to you Danny...