If you think that someone behave to you like an angel or someone is kind to your or maybe he or she do some angel gesture to you showing that you are not impassive and give your buddy appropriate free angel emoticon and you will show yourself as a gentleman (lady).

Emoticon	Meaning	Emoticon	Meaning
	White		Yes No Angel
	Angel with yellow wings		Wings
	Undecided		Transforming
	Thinking		Bow arrow
	Colored		Devil in angel
	Yellow aureola		Green smiley
	Smile		Sad
	Rolling Eyes		Grey
	Small Wings		Little Angel
	Just angel		Aureola Fly
	Circling Aureola		Angel Kiss
	Baby Angel		Blinking Aureola
	Devlish Angel		Fly or Not to Fly
	Less and Less Angel		No No Angel
	Not Angel Anymore		White Angel
	Bow Angel		Praying Angel
	Big Wings Angel		Cupid
	Double Aureola		Big Smile
	Blue Angel		Fat Angel
	Like Angel		Power Angel Girl 1
	Power Angel Girl 2		Power Angel Girl 3
	Rose Dress		Grandpa
	Green		Very Little Angel
	Hairy		Hypocrite
	Innocent		Blue Aureola
	Fairy		Little Dark Blue
	Green Thinking About		Nuisance Angel
	Smiley Angel		Xmas
	Angel After Life		In Angels Mind
	Inconvenient Angel		Nice Angel
	Orange Angel

Also have in mind that you are trying to show yourself as an angel. Or maybe you try to laugh your friend by showing him that you are angel in that moment or situation than you should use it.