1) The thirty-ish couple: Just a "connection" discretely passing some crack cocain to the woman.
2) The couple of 35 years: They are sharing a smile because she knows he is wearing panties under his trousers.
3) The couple with the baby: She has tears in her eyes because she is afraid her husband will find out that it was her boss that fathered the child he thinks is his.
4) The two women: These two just might be in love.
5) The twenty-ish couple on the porch: He just told her he has a feather fetish. But only when they are attached to chickens.