当电灯泡要执照
[dāng diàn dēng pào yào zhí zhào]
'Being a Third Wheel Requires Permission' means it acknowledges oneself might join a couple in situations where there would originally be only two. Here, being 'a third wheel', which refers to an extra person accompanying a couple and potentially disturbing, becomes somewhat legit by the user's self-deprecation or joke-making spirit.