"Look at my arms flailing. I'm like a flamingo on Ritalin."
Why it's apropos: Both slightly pink in color, Sheldon and flamingos are an unlikely, yet oddly suitable, pair. For example, they both stand tall, proud, and occasionally squawk at passersby. Plus, the fact that they both look hilarious while losing their balance is merely an added bonus.
"The Cooper-Hofstadter Polarization" (Episode 9, Season 1)