Separately posted so you can avoid it if you wish.
As witnessed first hand by a trustworthy source (ie not me!)
Father brings child of about 2 years old intio A & E with breathing difficuklties. Doctor notices that child has VERY snotty, bunged up, bogey-laden nose and asks father if he can clean nose before she examines child.
Fathe puts his own mouth around child's nostrils and SUCKS HARD to clear nose.
?