We need a motion graphic in Adobe After Effects. They will resemble a simple speech bubble (see attached PSD). It will pop up larger and then grow smaller. Here is an example of the exact effect:
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Effect at 0:17 and 0:37
This is the same motion effect and does not change. Only the graphic changes. Effect must be identical (please note the effect is a little bouncy when larger and then growing smaller). Should take about 15-20 minutes to create the effect for an experience user of After Effects.
I have attached a PSD file which recreates the speech bubbles to be used.