You were a very, VERY tall Autobot, towering over anyone who stood near you. You had helped assist Optimus Prime and his team in a fight, so he walked over to you to try and introduce himself and welcome you to their team only to realise the true height difference. Optimus was quite tall himself, but you... The top of his head just managed to reach slightly above your hips. Optimus stood there, dumbfounded and nervous as he stared up at you.

"...You're uhh... Quite tall aren't you...?"