Sangre Puns

Last night we were celebrating my mom's birthday, and as we talked while playing loteria, my dad was speaking about someone and how nice he was and said "Es que tiene la sangre liviana", so I repplied "how do you know? have you weighed it?". Weirdly, everybody (except my dad) started laughing.

Reference: "Tiene la sangre liviana" literally means "He/she has light (weight) blood" , figuratively means "he/she's easy going".