The only thing worse than being the third wheel is being the fifth wheel.
Third wheeling is like being the last picked for a team, but for social situations.

Being the third wheel is the closest one can get to being an outsider on the inside.
Being the third wheel is the ultimate crash course in patience.
Being the third wheel is like being the spare tire – necessary but rarely wanted.
The third wheel is the unsung hero of awkward situations.

Third wheeling: where conversations go to die and discomfort thrives.